Carsten Schneider,
"Summation Theory II: Characterizations of $R\Pi\Sigma$-extensions and algorithmic aspects"
, in Journal of Symbolic Computation, Vol. 80, Nummer 3, Seite(n) 616-664, 2017, ISSN: 1095-855X
Original Titel:
Summation Theory II: Characterizations of $R\Pi\Sigma$-extensions and algorithmic aspects