@inbook{403766, title = {P\v redmluva}, booktitle = {Booleova algebra}, series = {GDML\_Books}, publisher = {Mlad\'a fronta}, address = {Praha}, year = {1973}, pages = {3-[4]}, url = {http://dml.mathdoc.fr/item/403766} }
(éd.). Předmluva, dans Booleova algebra, GDML_Books, (1973), pp. 3-[4]. http://gdmltest.u-ga.fr/item/403766/