%0 Journal Article %A Martini, Horst %A Spirova, Margarita %T A new type of orthogonality for normed planes %J Czechoslovak Mathematical Journal %D 2010 %P 339-349 %V 60 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_2010__60_2_a3/ %G en %F CMJ_2010__60_2_a3