Lua APA (7ú heag.)
Appell, J., De Pascale, E., & Vignoli, A. (2004). Nonlinear spectral theory. Walter de Gruyter.
Lua i Stíl Chicago (17ú heag.)
Appell, Jürgen, Espedito De Pascale, agus Alfonso Vignoli. Nonlinear Spectral Theory. Berlin ; New York: Walter de Gruyter, 2004.
Lua MLA (9ú heag.)
Appell, Jürgen, et al. Nonlinear Spectral Theory. Walter de Gruyter, 2004.
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