@unpublished{Greuel1999,
author = {Gert-Martin Greuel},
title = {Description of SINGULAR: A Computer Algebra System for Singularity Theory, Algebraic Geometry and Commutative Algebra},
institution = {Fachbereich Mathematik},
series = {Reports on Computer Algebra (ZCA Report)},
number = {7},
year = {1999}
}