%0 Journal Article %A Došlý, Ondřej %T The Picone identity for a class of partial differential equations %J Mathematica Bohemica %D 2002 %P 581-589 %V 127 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/MB.2002.133959/ %R 10.21136/MB.2002.133959 %G en %F 10_21136_MB_2002_133959