Constructible Differentially Finite Algebraic Series in Several Variables

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\begin{bibtex} @article{DBLP:journals/tcs/BergeronS95,

 author    = {Fran\c{c}ois Bergeron and
              Ulrike Sattler},
 title     = {Constructible Differentially Finite Algebraic Series in
              Several Variables},
 journal   = {Theor. Comput. Sci.},
 volume    = {144},
 number    = {1{\&}2},
 year      = {1995},
 pages     = {59-65},
 ee        = {http://dx.doi.org/10.1016/0304-3975(94)00297-V},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}