@article{10_4153_CMB_1963_011_7,
     author = {Duff, G. F. D. and Ross, R. A.},
     title = {Indefinite {Green's} {Functions} and {Elementary} {Solutions}},
     journal = {Canadian mathematical bulletin},
     pages = {71--103},
     year = {1963},
     volume = {6},
     number = {1},
     doi = {10.4153/CMB-1963-011-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1963-011-7/}
}