[1] V. Jarník: Diophantische Approxirnationen und Hausdorffsches Mass. Матем. Сборник 36, 371-382 (1929).
[3] A. S. Besicovitch:
Sets of fractional dimensions IV: On rational approximation to real numbers. Journ. London Math. Soc. 9, 126-131 (1934).
Zbl 0009.05301