@article{GDZPPN002294729, title = {Dually Residuated Lattice Ordered Semigroups, II.}, journal = {Mathematische Annalen}, volume = {161}, year = {1965}, pages = {64-71}, zbl = {0138.02104}, url = {http://dml.mathdoc.fr/item/GDZPPN002294729} }
SWAMY, K.L.N. Dually Residuated Lattice Ordered Semigroups, II.. Mathematische Annalen, Tome 161 (1965) pp. 64-71. http://gdmltest.u-ga.fr/item/GDZPPN002294729/