@misc{Volterra_Vito_(1860–1940)_Sopra_1891,
 author={Volterra, Vito (1860–1940)},
 copyright={Public Domain},
 address={Roma},
 journal={Opere matematiche : memorie e note / Vito Volterra},
 howpublished={online},
 year={1891},
 publisher={Accademia Nazionale dei Lincei},
 language={ita},
 type={Text},
 title={Sopra le equazioni di Hertz},
 URL={http://www.rcin.org.pl/Content/152966/PDF/WA35_185773_11086-1_30.pdf},
}