Struwe, M. (1990). Variational methods: Applications to nonlinear partial differential equations and hamiltonian systems. Springer-Verlag.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रStruwe, Michael. Variational Methods: Applications to Nonlinear Partial Differential Equations and Hamiltonian Systems. Nueva York: Springer-Verlag, 1990.
एमएलए (9वां संस्करण) प्रशस्ति पत्रStruwe, Michael. Variational Methods: Applications to Nonlinear Partial Differential Equations and Hamiltonian Systems. Springer-Verlag, 1990.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.