@article{10_4153_CMB_1987_004_x,
     author = {Eloe, P. W.},
     title = {Sign {Properties} of {Green's} {Functions} {For} {Two} {Classes} of {Boundary} {Value} {Problems}},
     journal = {Canadian mathematical bulletin},
     pages = {28--35},
     year = {1987},
     volume = {30},
     number = {1},
     doi = {10.4153/CMB-1987-004-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1987-004-x/}
}