@article{GDZPPN002333287,
title = {The existence of nonclassical asymptotic expansion of the trace of a heat kernel for a degenerate elliptic operator.},
journal = {Mathematische Annalen},
volume = {283},
year = {1989},
pages = {447-462},
zbl = {0663.35032},
url = {http://dml.mathdoc.fr/item/GDZPPN002333287}
}
Xu, Chuan-yi. The existence of nonclassical asymptotic expansion of the trace of a heat kernel for a degenerate elliptic operator.. Mathematische Annalen, Tome 283 (1989) pp. 447-462. http://gdmltest.u-ga.fr/item/GDZPPN002333287/