@article{JRAM_1967__227_150799,
     author = {J. Levine and J.V. Brawley},
     title = {Involutory commutants with some applications to algebraic cryptography. {II}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--24},
     publisher = {mathdoc},
     volume = {227},
     year = {1967},
     zbl = {0178.03401},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1967__227_150799/}
}