@article{SF_1979__17_134310,
     author = {M. Satyanarayana and C.S. Nagore},
     title = {Integrally ordered semigroups.},
     journal = {Semigroup forum},
     pages = {101--112},
     year = {1979},
     volume = {17},
     zbl = {0401.06008},
     url = {http://geodesic.mathdoc.fr/item/SF_1979__17_134310/}
}