by Bali, N. P | Iyengar, N. Ch. S. Narayana | Saxena, Ashok.
by Kreyszig, Erwin.
by Wylie, C. Ray | Barrett, Louis C.
by Trim, Donald.
by Tou, Stephen.
by Bird, John.
by Lynch, Stephen.
by Guler, Osman.
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