@article{SF_1983__27_134621,
     author = {L.N. Shevrin and A.J. Ovsyannikov},
     title = {Semigroups and their subsemigroup lattices.},
     journal = {Semigroup forum},
     pages = {1--154},
     publisher = {mathdoc},
     volume = {27},
     year = {1983},
     zbl = {0523.20037},
     url = {http://geodesic.mathdoc.fr/item/SF_1983__27_134621/}
}