[1] D. Duffus W. Pogunthe I. Rival:
Retracts and the fixed point problem for finite partially ordered sets. Canad. Math. Bull. 23, 1980, 231 - 236.
DOI 10.4153/CMB-1980-031-2 |
MR 0576104
[5] L. Fuchs:
Partially ordered algebraic systems. Pergamon Press, Oxford-London - New York-Paris, 1963.
MR 0171864 |
Zbl 0137.02001
[6] J. Jakubík: Direct decompositions of partially ordered groups. (Russian.) Czech. Math. J. 10, 1960, 231-243.