@inbook{403908,
title = {IV. kapitola. Oblasti rovinn\'eho grafu, du\'aln\'\i\ graf},
booktitle = {Rovinn\'e grafy},
series = {GDML\_Books},
publisher = {Mlad\'a fronta},
address = {Praha},
year = {1977},
pages = {51-70},
url = {http://dml.mathdoc.fr/item/403908}
}
(éd.). IV. kapitola. Oblasti rovinného grafu, duální graf, dans Rovinné grafy, GDML_Books, (1977), pp. 51-70. http://gdmltest.u-ga.fr/item/403908/