@inbook{401347, title = {18. Norm\'aln\'\i\ soustava vektor\r u}, booktitle = {Z\'aklady teorie matic}, series = {GDML\_Books}, publisher = {Academia}, address = {Praha}, year = {1971}, pages = {125-136}, url = {http://dml.mathdoc.fr/item/401347} }
(éd.). 18. Normální soustava vektorů, dans Základy teorie matic, GDML_Books, (1971), pp. 125-136. http://gdmltest.u-ga.fr/item/401347/