@book{401706, title = {Jan Sobotka (1862--1931)}, series = {GDML\_Books}, publisher = {Matfyzpress}, address = {Praha}, year = {2010}, language = {en}, url = {http://dml.mathdoc.fr/item/401706} }
Kašparová, Martina; Nádeník, Zbyněk. Jan Sobotka (1862–1931). GDML_Books (2010), http://gdmltest.u-ga.fr/item/401706/