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[2] Everson, Michael: The Alphabets of Europe. http://www.evertype.com/alphabets/

[3] Hetherington, Lee, Kohler, Eddie: T1utils. http://www.lcdf.org/type/t1asm.1.html http://www.lcdf.org/type/t1disasm.1.html

[4] Hobby, John D.: METAPOST. https://ctan.org/pkg/metapost

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[5] Knuth, Donald E.: The METAFONTbook.

[5] Knuth, Donald E.: METAFONT: The Program.

[5] Knuth, Donald E.: Computer Modern Typefaces.

[6] Hudson, John: Introducing OpenType Variable Fonts. 2016 https://medium.com/@tiro/https-medium-com-tiro-introducing-opentype-variable-fonts-12ba6cd2369

[7] Jackowski, Bogusław, Nowacki, Janusz M., Strzelczyk, Piotr: Antykwa Półtawskiego: a parameterized outline font. Proceedings of the EuroTEX Conference, Heidelberg, Germany, 1999 article: http://www.staff.uni-giessen.de/partosch/eurotex99/jackowski download: http://www.gust.org.pl/projects/e-foundry/poltawski

[8] Jackowski, Bogusław, Ryćko, Marek: Polish extension of Computer Modern fonts. https://ctan.org/pkg/pl-mf

[9] Jackowski, Bogusław, Strzelczyk, Piotr, Pianowski, Piotr: GUST e-foundry math fonts. The Latin Modern Math (LM Math) font: http://www.gust.org.pl/projects/e-foundry/lm-math The TEX Gyre (TG) Math Fonts: http://www.gust.org.pl/projects/e-foundry/tg-math https://ctan.org/pkg/tex-gyre-math

[10] Jackowski, Bogusław, Strzelczyk, Piotr: How to make more than one math OpenType font or the Beasts of Fonts. DANTE 2011 Meeting, Bremen, Germany, 2011

[11] Jackowski, Bogusław, Nowacki, Janusz M., Strzelczyk, Piotr: The Latin Modern (LM) Family of Fonts. http://www.gust.org.pl/projects/e-foundry/latin-modern

[12] Jackowski, Bogusław, Nowacki, Janusz M.: Latin Modern fonts: how less means more. Proceedings of the EuroTEX conference, Pont-à-Mousson, France, 2005 http://tug.org/TUGboat/tb27-0/jackowski.pdf

[13] Jackowski, Bogusław, Nowacki, Janusz M., Strzelczyk, Piotr: MetaType 1: a METAPOST-based engine for generating Type 1 fonts. 2001 article: http://www.ntg.nl/maps/26/15.pdf presentation: http://ntg.nl/eurotex/JackowskiMT.pdf download: https://ctan.org/pkg/metatype1

[14] Jackowski, Bogusław, Nowacki, Janusz M., Strzelczyk, Piotr: The TeX Gyre (TG) Collection of Fonts. http://www.gust.org.pl/projects/e-foundry/tex-gyre

[15] Jackowski, Bogusław, Nowacki, Janusz M., Strzelczyk, Piotr: TeX Gyre Pagella Math or Misfortunes of Math Typographer. http://www.gust.org.pl/projects/e-foundry/tex-gyre

[16] Knappen, Jörg, Schwarz, Norbert: European Computer Modern Fonts. https://ctan.org/pkg/ec

[17] Knuth, Donald E.: METAFONT and METAPOST logo fonts. https://ctan.org/pkg/mflogo-font

[18] Ludwichowski, Jerzy B.: GUST font licenses. BachoTEX XIV, Bachotek, Poland, 2006 http://tug.org/fonts/licenses/gfl.pdf

[19] Ludwichowski, Jerzy B., Berry, Karl: GUST Font License: An application of the LaTeX Project Public License. XVII European TeX Conference and BachoTeX XV, Bachotek, Poland, 2007; TUGboat, Volume 29 (2008), No. 1 http://www.gust.org.pl/projects/e-foundry/licenses/tb91Berry_Ludwichowski.pdf

[20] Ludwichowski, Jerzy B.: Licensing of the TeX Gyre family of fonts. XIX European TeX Conference and 3rd International ConTeXt User Meeting, The Hague, The Netherlands, 2009 https://www.ntg.nl/EuroTeX/2009/slides/jerzy-slides.pdf

[21] Ludwichowski, Jerzy B.: Is there life besides licensing?. DANTE e.V. General Meeting, Bremen, Germany, 2011 https://www.dante.de/events/Archiv/dante2011/programm/vortraege/folien-jl.pdf

[22] Nowacki, Janusz M.: Polish fonts. http://jmn.pl/en/

[23] Strzelczyk, Piotr: Standard Unicode w typografii. Acta Poligraphica nr 1/2013 (in Polish; to be published also in English under the title Standard Unicode in typography) http://www.cobrpp.com.pl/actapoligraphica/uploads/pdf/AP2013_01_Strzelczyk.pdf

[23] Strzelczyk, Piotr: (uni)coding of math fonts. BachoTeX XIX, Bachotek, Poland, 2011 http://www.gust.org.pl/bachotex/2011-en/presentations/Strzelczyk_1_2011

[24] Vieth, Ulrik: OpenType math illuminated. TUGboat, Volume 30 (2009), No. 1, http://tug.org/TUGboat/tb30-1/tb94vieth.pdf

[25] Williams, George: FontForge. FontForge project contributors, FontForge. http://fontforge.github.io/en-US/

[26] Adobe Font Development Kit for OpenType. http://adobe.com/devnet/opentype/afdko.html

[27] Adobe base 35 fonts. Adobe original AFM files: ftp://ftp.adobe.com/pub/adobe/type/win/all/afmfiles/base35/ URW replacement: https://ctan.org/pkg/urw-base35

[28] Adobe Type 1 Font Format. https://partners.adobe.com/public/developer/en/font/T1_SPEC.PDF

[29] MATH - The mathematical typesetting table. https://www.microsoft.com/typography/OTSPEC/math.htm

[30] GUST Font License. http://www.gust.org.pl/fonts/licenses/GUST-FONT-LICENSE.txt http://tug.org/fonts/licenses/GUST-FONT-LICENSE.txt

[31] OpenType specification. http://www.microsoft.com/en-ph/download/details.aspx?id=1144

[32] OpenType Feature File Specification. http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html

[33] Registered features — definitions and implementations (p – t). https://www.microsoft.com/typography/otspec/featuretags.htm

[34] Spalinger, Nicolas, Gaultney, Victor: SIL Open Font License. https://scripts.sil.org/OFL

[35] The Unicode Standard 9.0.0. 2016 http://unicode.org/versions/Unicode9.0.0

[36] The Unicode Standard: A Technical Introduction. http://unicode.org/standard/principles.html

[37] Beeton, Barbara, Freytag, Asmus, III, Murray Sargent: Unicode Technical Report #25. Unicode Support for Mathematics. http://unicode.org/reports/tr25/