APA
Fraenkel L. E., . (2011). Introduction to maximum principles and symmetry in elliptic problems. : Cambridge.
Chicago
Fraenkel L E, . 2011. Introduction to maximum principles and symmetry in elliptic problems. : Cambridge.
Harvard
Fraenkel L. E., . (2011). Introduction to maximum principles and symmetry in elliptic problems. : Cambridge.
MLA
Fraenkel L E, . Introduction to maximum principles and symmetry in elliptic problems. : Cambridge. 2011.