@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/