@article{GDZPPN002345234,
title = {On spectral functions belonging to an elliptic differential operator with variable coefficients},
journal = {Mathematica Scandinavica},
volume = {5},
year = {1957},
pages = {241-254},
zbl = {0080.30701},
url = {http://dml.mathdoc.fr/item/GDZPPN002345234}
}
BERGENDAL, GUNNAR. On spectral functions belonging to an elliptic differential operator with variable coefficients. Mathematica Scandinavica, Tome 5 (1957) pp. 241-254. http://gdmltest.u-ga.fr/item/GDZPPN002345234/