Periodic solutions of a differential delay equation of Rayleigh type
Rendiconti del Seminario Matematico della Università di Padova, Tome 61 (1979), pp. 115-124. 
@article{RSMUP_1979__61__115_0,
     author = {Invernizzi, S. and Zanolin, F.},
     title = {Periodic solutions of a differential delay equation of {Rayleigh} type},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {115--124},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {61},
     year = {1979},
     mrnumber = {569654},
     zbl = {0429.34064},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1979__61__115_0/}
}
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Invernizzi, S.; Zanolin, F. Periodic solutions of a differential delay equation of Rayleigh type. Rendiconti del Seminario Matematico della Università di Padova, Tome 61 (1979), pp. 115-124. http://www.numdam.org/item/RSMUP_1979__61__115_0/

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