@article{IVM_1970_10_a5,
     author = {E. S. Lyapin and A. E. Evseev},
     title = {Semigroups whose subsemigroups are all unit ideal},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {44--48},
     publisher = {mathdoc},
     number = {10},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_10_a5/}
}