@misc{Volterra_Vito_(1860–1940)_Sul_1893,
 author={Volterra, Vito (1860–1940)},
 volume={Vol. 1, 1881-1892},
 copyright={Public Domain},
 address={Roma},
 journal={Opere matematiche : memorie e note / Vito Volterra},
 howpublished={online},
 year={1893},
 publisher={Accademia Nazionale dei Lincei},
 language={ita},
 title={Sul principio di Huyghens},
 type={Text},
 URL={http://www.rcin.org.pl/Content/153161/PDF/WA35_185796_11086-1_36.pdf},
}