TY - JOUR AU - Eloe, P. W. TI - Sign Properties of Green's Functions For Two Classes of Boundary Value Problems JO - Canadian mathematical bulletin PY - 1987 SP - 28 EP - 35 VL - 30 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1987-004-x/ DO - 10.4153/CMB-1987-004-x ID - 10_4153_CMB_1987_004_x ER -