@techreport{RISC1261,author = {C. Schneider},
title = {{The summation package Sigma: Underlying principles and a rhombus tiling application}},
language = {english},
number = {04-07},
year = {2004},
month = {May},
keywords = {symbolic summation, difference fields, telescoping, creative telescoping, solving recurrences},
sponsor = {Supported by the Austrian Academy of Sciences, the SFB-grant F1305 of the Austrian FWF and by grant P16613-N12 of the Austrian FWF.},
length = {0},
type = {RISC Report Series},
institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz},
address = {Altenberger Straße 69, 4040 Linz, Austria},
issn = {2791-4267 (online)}
}