@incollection {shemyakova:2009:non-hyperbolic_properties_of_facts,
   author = {Shemyakova, Ekaterina},
   affiliation = {J.Kepler University Research Institute for Symbolic Computation (RISC) Altenbergerstr. 69 A-4040 Linz Austria},
   title = {Invariant Properties of Third-Order Non-hyperbolic Linear Partial Differential Operators},
   booktitle = {Intelligent Computer Mathematics},
   series = {Lecture Notes in Computer Science},
   editor = {Carette, Jacques and Dixon, Lucas and Coen, Claudio and Watt, Stephen},
   publisher = {Springer Berlin / Heidelberg},
   isbn = {},
   pages = {154-169},
   volume = {5625},
   url = {http://dx.doi.org/10.1007/978-3-642-02614-0_16},
   note = {10.1007/978-3-642-02614-0_16},
   year = {2009}
}