@article{RISC204,
author = {C. Schneider},
title = {{Product Representations in $\Pi\Sigma$-Fields}},
language = {english},
journal = {Annals of Combinatorics},
volume = {9},
number = {1},
pages = {75--99},
isbn_issn = {ISSN 0218-0006},
year = {2005},
note = {Preliminary version online},
refereed = {yes},
length = {25}
}