%0 Journal Article %A Niimura, Mikio %T On a Uniqueness Theorem %J Canadian journal of mathematics %D 1979 %P 1072-1076 %V 31 %N 5 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1979-098-4/ %R 10.4153/CJM-1979-098-4 %F 10_4153_CJM_1979_098_4