@misc{Ghersi_Italo_(1861–1925)_Matematica_1913,
 author={Ghersi, Italo (1861–1925)},
 copyright={Public Domain},
 address={Milano},
 journal={Manuali Hoepli},
 howpublished={online},
 year={1913},
 publisher={Urlico Hoepli},
 language={ita},
 title={Matematica dilettevole e curiosa : problemi bizzarri, paradossi algebrici [...]},
 type={Text},
 URL={http://rcin.org.pl/impan/Content/84675/PDF/WA35_13877_5178_Matematica.pdf},
}