@misc{Ince_Edward_Lindsay_(1891–1941)_Ordinary_1927,
 author={Ince, Edward Lindsay (1891–1941)},
 copyright={Public Domain},
 address={London [etc.]},
 howpublished={online},
 year={1927},
 publisher={Longmans, Green and Co. Ltd.},
 language={eng},
 title={Ordinary differential equations},
 type={Text},
 URL={http://rcin.org.pl/impan/Content/87544/PDF/WA35_6798_4326_Ordinary.pdf},
}