[1] Droste, M.:
k-homogeneous relations and tournaments. Quart. J. Math. Oxford, (2) 40 (1989), 1-11.
MR 0985534
[2] Rachůnek, J.:
Semi-ordered groups. Acta UP Olomucensis, Fac. rer. nat., 61 (1979), 5-20.
MR 0589842
[3] Rachůnek, J.:
Solid subgroups of weakly associative lattice ordered groups. Acta UP Olomucensis, Fac. rer. nat., 105 (1992), Math. 31, 13-24.
MR 1212601
[4] Rachůnek, J.: Groupes faiblement réticulés. In: Sémin. Structures Alg. Ordonnées, Univ. Paris VII, No. 42, 1993, (11 pp.).
[5] Rachůnek, J.:
Varieties of weakly associative lattice groups. (To appear in Czechoslovak Math. J.)
MR 1388612