[1] BENADO M.:
Les ensembles paгtiellement ordonnées et le théorème de гaffinement de Schreieг. II. Czechosl. Math. J. 5, 1955, 308-344.
MR 0076744
[2] BIRKHOFF G.:
Lattice theoгy. third edition. Amer. Math. Soc. Colloquium Publications Vol. XXV, 1967, Providence.
MR 0227053
[3] GINSBURG S., ISBELL J. R.:
The categoгy of cofìnal types. I. Tгans. Ameг. Math. Soc. 116, 1965, 386-393.
MR 0201315
[4] ISBELL J. R.:
Thѳ category of cofinal types. II. Trans. Ameг. Math. Soc. 116, 1965, 393-416.
MR 0201316
[5] LAVER R.:
On Fraissé's ordeг type conjectuгѳ. Ann. Math. 2 (93), 1971, 89-111.
MR 0279005