@misc{Kirchhoff_Gustav_Robert_(1824–1887)_Vorlesungen_1876, author={Kirchhoff, Gustav Robert (1824–1887)}, copyright={Public Domain}, address={Leipzig}, howpublished={online}, year={1876}, publisher={B. G. Teubner}, language={ger}, title={Vorlesungen über Mechanik}, title={Mechanik}, type={Text}, URL={http://rcin.org.pl/impan/Content/77882/PDF/WA35_3306_6674_Vorlesungen.pdf}, }