@article{GDZPPN002186667,
title = {Universal and internal properties of some extensions of partially orderd sets.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {253},
year = {1972},
pages = {28-42},
zbl = {0237.06001},
url = {http://dml.mathdoc.fr/item/GDZPPN002186667}
}
Schmidt, Jürgen. Universal and internal properties of some extensions of partially orderd sets.. Journal für die reine und angewandte Mathematik, Tome 253 (1972) pp. 28-42. http://gdmltest.u-ga.fr/item/GDZPPN002186667/