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@article{MZ_1992__209_2_174371, author = {Andrej Szulkin}, title = {Cohomology and {Morse} theory for strongly indefinite functionals.}, journal = {Mathematische Zeitschrift}, pages = {375--418}, publisher = {mathdoc}, volume = {209}, number = {2}, year = {1992}, zbl = {0735.58012}, url = {http://geodesic.mathdoc.fr/item/MZ_1992__209_2_174371/} }
Andrej Szulkin. Cohomology and Morse theory for strongly indefinite functionals.. Mathematische Zeitschrift, Tome 209 (1992) no. 2, pp. 375-418. http://geodesic.mathdoc.fr/item/MZ_1992__209_2_174371/