@article{ASNSP_1987_4_14_1_79_0, author = {Dieckerhoff, R. and Zehnder, E.}, title = {Boundedness of solutions via the twist-theorem}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {79--95}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 14}, number = {1}, year = {1987}, zbl = {0656.34027}, mrnumber = {937537}, language = {en}, url = {http://www.numdam.org/item/ASNSP_1987_4_14_1_79_0/} }