Solutions of minimal period of a wave equation via a generalization of a Hofer's theorem
Rendiconti del Seminario Matematico della Università di Padova, Tome 81 (1989), pp. 49-63. 
@article{RSMUP_1989__81__49_0,
     author = {Salvatore, A.},
     title = {Solutions of minimal period of a wave equation via a generalization of a {Hofer's} theorem},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {49--63},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {81},
     year = {1989},
     mrnumber = {1020185},
     zbl = {0696.35109},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1989__81__49_0/}
}
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Salvatore, A. Solutions of minimal period of a wave equation via a generalization of a Hofer's theorem. Rendiconti del Seminario Matematico della Università di Padova, Tome 81 (1989), pp. 49-63. http://archive.numdam.org/item/RSMUP_1989__81__49_0/

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