Schafer, P. (1988). Maximum principles and eigenvalue problems in partial differential equations. Longman.
शिकागो स्टाइल उद्धरणSchafer, P.W. Maximum Principles and Eigenvalue Problems in Partial Differential Equations. Longman, 1988.
एमएलए उद्धरणSchafer, P.W. Maximum Principles and Eigenvalue Problems in Partial Differential Equations. Longman, 1988.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.