TY - JOUR AU - Došlý, Ondřej TI - The Picone identity for a class of partial differential equations JO - Mathematica Bohemica PY - 2002 SP - 581 EP - 589 VL - 127 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/MB.2002.133959/ DO - 10.21136/MB.2002.133959 LA - en ID - 10_21136_MB_2002_133959 ER -