@article{GDZPPN002191237,
title = {The order-sum in classes of partially ordered algebras.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {272},
year = {1975},
pages = {78-92},
zbl = {0325.08002},
url = {http://dml.mathdoc.fr/item/GDZPPN002191237}
}
Höft, Margret. The order-sum in classes of partially ordered algebras.. Journal für die reine und angewandte Mathematik, Tome 272 (1975) pp. 78-92. http://gdmltest.u-ga.fr/item/GDZPPN002191237/