@inbook{404205, title = {P\v redmluva}, booktitle = {Trigonometrie}, series = {GDML\_Books}, publisher = {P\v r\'\i rodov\v edeck\'e nakladatelstv\'\i }, address = {Praha}, year = {1952}, pages = {3-4}, url = {http://dml.mathdoc.fr/item/404205} }
(éd.). Předmluva, dans Trigonometrie, GDML_Books, (1952), pp. 3-4. http://gdmltest.u-ga.fr/item/404205/