[G] J. GURIČAN: Strengthening of the triangle inequality. (unpublished)
[G-Z 1] J. GURIČAN P.  ZLATOŠ: 
Biequivalences and topology in the alternative set theory. Comment. Math. Univ. Carolina. 26 (1985), 525-552. 
MR 0817825[M 2] J. MLČEK: 
Valuations of structures. Comment. Math. Univ. Carolinae 20 (1979), 681-696. 
MR 0555183[S-V 2] A. SOCHOR P. VOPĚNKA: 
Revealments. Comment. Math. Univ. Carolinae 21 (1980), 97-118. 
MR 0566243[V] P. VOPĚNKA: 
Mathematics in the Alternative Set Theory. Teubner, Leipzig 1979; Russian translation, Mir, Moskva 1983. 
MR 0718490