@article{1077474299,
author = {Bergman, S. and Schiffer, M.},
title = {A representation of Green's and Neumann's functions in the
theory of partial differential equations of second order},
journal = {Duke Math. J.},
volume = {14},
number = {1},
year = {1947},
pages = { 609-638},
language = {en},
url = {http://dml.mathdoc.fr/item/1077474299}
}
Bergman, S.; Schiffer, M. A representation of Green’s and Neumann’s functions in the
theory of partial differential equations of second order. Duke Math. J., Tome 14 (1947) no. 1, pp. 609-638. http://gdmltest.u-ga.fr/item/1077474299/