@techreport{RISC2486,
author = {J. P. Bell and S. Gerhold},
title = {{The Positivity Set of a Recurrence Sequence}},
language = {english},
year = {2005},
note = {SFB report},
howpublished = {to appear in Israel J. Math.},
institution = {J. Kepler University Linz},
length = {11}
}