@article{JRAM_1966__224_150760,
     author = {Jack Levine and Joel V. Brawley},
     title = {Involutory commutants with some applications to algebraic cryptography. {I.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {20--43},
     publisher = {mathdoc},
     volume = {224},
     year = {1966},
     zbl = {0168.28204},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1966__224_150760/}
}