@misc{RISC3942,
author = {C. Schneider},
title = {{Difference Fields and Symbolic Summation in Sage}},
language = {english},
year = {2009},
month = {27. July},
note = {Invited talk at Combinat 2009 -- International Sage Workshop on Free and Practical Software for Algebraic Combinatorics},
institution = {RISC, J. Kepler University Linz, Hagenberg},
conferencename = {Combinat 2009 -- International Sage Workshop on Free and Practical Software for Algebraic Combinatorics},
url = {https://wiki.sagemath.org/combinat/FPSAC09//}
}