[1] G. Birkhoff:
Lattice Theory, third edition. Providence, Rhode Island, 1967.
MR 0227053
[2] O. Borůvka:
Grundlagen der Gruppoid- und Gruppentheorie. VEB Deutscher Verlag der Wissenschaften, Berlin, 1960.
MR 0117267
[3] V. Novák:
On the pseudodimension of ordered sets. Czechoslovak Math. J. 13 (88) (1963), 587–598.
MR 0180507
[5] M. Novotný:
Ternary structures and groupoids. Czechoslovak Math. J. 41 (116) (1991), 90–98.
MR 1087627
[6] M. Novotný:
Dependence spaces of information systems. In: Incomplete Information: Rough Set Analysis, E. Orlowska (ed.), Physica Verlag, 1998, pp. 193–289.
MR 1647378