@article{RISC2873,
author = {M. Kauers and C. Schneider},
title = {{Indefinite summation with unspecified summands}},
language = {english},
journal = {Discrete Math.},
volume = {306},
number = {17},
pages = {2073--2083},
isbn_issn = {ISSN 0012-365X},
year = {2006},
note = {Preliminary version online},
refereed = {yes},
length = {11}
}