@article{SF_1977__15_134251,
     author = {C. Sri Hari Nagore},
     title = {Quasi commutative {Q-semigroups.}},
     journal = {Semigroup forum},
     pages = {189--194},
     publisher = {mathdoc},
     volume = {15},
     year = {1977},
     zbl = {0378.20046},
     url = {http://geodesic.mathdoc.fr/item/SF_1977__15_134251/}
}