%0 Journal Article %A Zelinka, Bohdan %T The 3-path-step operator on trees and unicyclic graphs %J Mathematica Bohemica %D 2002 %P 33-40 %V 127 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/MB.2002.133982/ %R 10.21136/MB.2002.133982 %G en %F 10_21136_MB_2002_133982