%0 Journal Article %A Basagni, S. %A Bruschi, D. %A Ravasio, F. %T On the difficulty of finding walks of length k %J RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications %D 1997 %P 429-435 %V 31 %N 5 %I EDP-Sciences %U http://www.numdam.org/item/ITA_1997__31_5_429_0/ %G en %F ITA_1997__31_5_429_0