@article{1183527967,
author = {Freeman, R. S.},
title = {On the spectrum and resolvent of homogeneous elliptic differential operators with constant coefficients},
journal = {Bull. Amer. Math. Soc.},
volume = {72},
number = {4},
year = {1966},
pages = { 538-541},
language = {en},
url = {http://dml.mathdoc.fr/item/1183527967}
}
Freeman, R. S. On the spectrum and resolvent of homogeneous elliptic differential operators with constant coefficients. Bull. Amer. Math. Soc., Tome 72 (1966) no. 4, pp. 538-541. http://gdmltest.u-ga.fr/item/1183527967/