APA

Sperb R. P., Sperb R. P., . (1981). Maximum principles and their applications. New York [u.a.]: Academic Press.

Chicago

Sperb René P, Sperb René Peter, . 1981. Maximum principles and their applications. New York [u.a.]: Academic Press.

Harvard

Sperb R. P., Sperb R. P., . (1981). Maximum principles and their applications. New York [u.a.]: Academic Press.

MLA

Sperb René P, Sperb René Peter, . Maximum principles and their applications. New York [u.a.]: Academic Press. 1981.