@article{BaerMoroianu2003,
  author    = {Christian B{\"a}r and Sergiu Moroianu},
  title     = {Heat kernel asymptotics for roots of generalized laplacians},
  url       = {http://users.math.uni-potsdam.de/~baer/preprints/hta.html},
  year      = {2003},
}