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Berlín : Springer-Verlag, 1970 .
vi, 443 p.

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554 p. ; 25 cm.

By Miranda, Carlo.
New York : Springer-Verlag, 1970 .
xii, 370 p. :

By Sneddon, Ian N..
Tokyo : McGraw-Hill, 1957 .
xi, 327 p. , Contiene problemas.

By Bensoussan, Alain.
Paris : DUNOD, 1971 .
338 p. ; 25 cm.