[1] Ganter B., Wille R.: Formale Begriffsanalyse. Mаthemаtische Grundlаgen, Springer-Verlаg, 1996. MR 1715047 | Zbl 0861.06001

[2] Hаndbook of Incidence Geometry. Buildings and Foundations, North-Holland, 1995, (chap. 6). MR 1360726

[3] Machala F.: Incidence structures of independent sets. Acta Univ. Palacki. Olomuc., Fac. rer. nat., Math. 38 (1999), 113-118. MR 1767196 | Zbl 0974.08001

[4] Machala F.: Incidence structures of type (p,n). Czech. Math. Journal (to appear). MR 1961995 | Zbl 1015.08001