Variational methods in nonlinear problems
Séminaire Goulaouic-Schwartz (1980-1981), Exposé no. 20, 5 p. 
@article{SEDP_1980-1981____A22_0,
     author = {Nirenberg, L.},
     title = {Variational methods in nonlinear problems},
     journal = {S\'eminaire Goulaouic-Schwartz},
     note = {talk:20},
     pages = {1--5},
     year = {1980-1981},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     zbl = {0477.35002},
     language = {en},
     url = {https://www.numdam.org/item/SEDP_1980-1981____A22_0/}
}
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Nirenberg, L. Variational methods in nonlinear problems. Séminaire Goulaouic-Schwartz (1980-1981), Exposé no. 20, 5 p.. https://www.numdam.org/item/SEDP_1980-1981____A22_0/

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