by Kaplansky, Irving.
by Shirali, Satish | Vasudeva, Harkrishan L.
by Chatterjee, B. C | Adhikari, M. R | Ganguly, S.
by Souza, Paulo Ney de | Silva, Jorge-Nuno.
by Mendelson, Bert.
by Simovici, Dan A | Djeraba, Chabane.
by Deza, Michel Marie | Laurent, Monique.
by Parthasarathy, K. R.
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