[1] G. BIRKHOFF: Lattice Theory. New Yoгk 1973.
[2] L. FUCHS:
Partially Ordered Algebraic Systems (Russian translation). Moskva 1965.
MR 0218283
[3] B. ŠMARDA:
Topologies in tl-gгoups. Arch. Math., Brno, 1967, 69-81.
MR 0223283
[4] B. ŠMARDA: Some types of tl-groups. Publ. Fac. Sci. Univ. J. E. Purkyně, Bгno, 507, 1969, 341-352.
[5] B. ŠMARDA:
Connectivity in tl-groups. Aгch. Math., Brno, 1976, 1-7.
MR 0447072