1. Maximal groups on which the permanent is multiplicative;Beasley, LeRoy B.;Canad. J. Math. 21 (1969), 495-497; corrigendum, ibid.,1969
2. Permanent groups;Beasley, Leroy B.;Proc. Amer. Math. Soc.,1972
3. Permanents;Marcus, Marvin;Amer. Math. Monthly,1965
4. The University Series in Higher Mathematics;Zariski, Oscar,1958