%0 Journal Article %A Eloe, P. W. %T Sign Properties of Green's Functions For Two Classes of Boundary Value Problems %J Canadian mathematical bulletin %D 1987 %P 28-35 %V 30 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1987-004-x/ %R 10.4153/CMB-1987-004-x %F 10_4153_CMB_1987_004_x