@article{701435,
     title = {Microlocal heat kernel asymptotics and inverse spectral problems},
     booktitle = {Proceedings of the Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1989},
     pages = {[93]-114},
     mrnumber = {MR1009567},
     zbl = {0702.35237},
     url = {http://dml.mathdoc.fr/item/701435}
}

Andersson, Stig I.; Högfors, Christian; Pettersson, Bo. Microlocal heat kernel asymptotics and inverse spectral problems, dans Proceedings of the Winter School "Geometry and Physics", GDML_Books,  (1989), pp. [93]-114. http://gdmltest.u-ga.fr/item/701435/