@misc{Levi-Civita_Tullio_(1873–1941)_The_1956,
 author={Levi-Civita, Tullio (1873–1941) and Nicola Zanichelli Editore. and Accademia nazionale dei Lincei.},
 address={Bologna},
 howpublished={online},
 year={1956},
 publisher={Nicola Zanichelli Editore},
 language={ita},
 type={Text},
 title={The mixed transformation of LAGRANGE's equations. « Nature », vol. 74 (1906), pp. 488-489},
 URL={http://www.rcin.org.pl/Content/159312/PDF/WA35_189096_11273-2_Art34.pdf},
}