[1] Glass A. M. W., Нolland W. C., McCleary S.: The structure of l-group varieties. Alg. Univ. 10 (1980), 1-20. MR 0552151

[2] Fried E.: Tournaments and non-associative lattices. Ann. Univ. Sci. Budapest, Sect. Math. 13 (1970), 151-164. MR 0321837

[3] Kurosch A. G.: Lectures on General Algebra. Fizmatgiz, Moscow, 1987 (in Russian).

[4] Martinez J.: Varieties of lattice-ordered groups. Math. Z. 137 (1974), 265-284. MR 0354483 | Zbl 0274.20034

[5] Neumann H.: Varieties of Groups. Springer Verlag, New York, 1967. MR 0215899 | Zbl 0251.20001

[6] Rachůnek J.: Semi-ordered groups. Acta Univ. Palacki. Olomuc., Fac. rer. nat. 61 (1979), 5-20. MR 0589842

[7] Rachůnek J.: Solid subgroups of weaky associative lattice groups. Acta Univ. Palacki. Olomuc., Fac. rer. nat. 105, Math. 31 (1992), 13-24. MR 1212601

[8] Rachůnek J.: On some varieties of weakly associative lattice groups. Czechoslovak Math. J. (to appear). MR 1388612 | Zbl 0870.06016

[9] Reilly N. R.: Varieties of lattice-ordered groups. In: Lattice-Ordered Groups (Advances and techniques) (eds. A. M. W. Glass and W.C. Holland), 228-277, Kluwer, Dordrecht-Boston-London, 1989. MR 1036080

[10] Skala H.: Trellis Theory. Memoirs AMS, Providence, 1972. MR 0325474 | Zbl 0242.06004