@inbook{402524,
title = {\'Use\v cky, poloprostory, orientace},
booktitle = {Z\'aklady analytick\'e geometrie. I},
series = {GDML\_Books},
publisher = {P\v r\'\i rodov\v edeck\'e vydavatelstv\'\i },
year = {1951},
pages = {68-85},
url = {http://dml.mathdoc.fr/item/402524}
}
(éd.). Úsečky, poloprostory, orientace, dans Základy analytické geometrie. I, GDML_Books, (1951), pp. 68-85. http://gdmltest.u-ga.fr/item/402524/