%0 Journal Article %A Andrzej Derdzinski %A Ch. B. Croke %T A lower bound for ... on manifolds with boundary. %J Commentarii mathematici Helvetici %D 1987 %P 106-121 %V 62 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1987__62_140079/ %F CMH_1987__62_140079