Periodic solutions near an equilibrium of a differential equation with a first integral
Rendiconti del Seminario Matematico della Università di Padova, Tome 77 (1987), pp. 193-206 
@article{RSMUP_1987__77__193_0,
     author = {Marzantowicz, Wac{\l}aw and Parusi\'nski, Adam},
     title = {Periodic solutions near an equilibrium of a differential equation with a first integral},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {193--206},
     year = {1987},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {77},
     zbl = {0651.34040},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1987__77__193_0/}
}
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Marzantowicz, Wacław; Parusiński, Adam. Periodic solutions near an equilibrium of a differential equation with a first integral. Rendiconti del Seminario Matematico della Università di Padova, Tome 77 (1987), pp. 193-206. https://www.numdam.org/item/RSMUP_1987__77__193_0/

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