Computation and simplification in Lie fields. - Joachim Apel; Wolfgang Lassner (EUROCAL, 1987)

An Extension of Buchberger's Algorithm and Calculations in Enveloping Fields of Lie Algebras. - Joachim Apel; Wolfgang Lassner (J. Symb. Comput., 1988)

FELIX - An Assistant for Alebraists. - Joachim Apel; Uwe Klaus (ISSAC, 1991)

Data Representation and In-built Compilation in the Computer Algebra Program FELIX. - Joachim Apel; Uwe Klaus (DISCO, 1992)

Division of Entire Functions by Polynomial Ideals. - Joachim Apel (AAECC, 1995)

A Gröbner Approach to Involutive Bases. - Joachim Apel (J. Symb. Comput., 1995)

The Theory of Involutive Divisions and an Application to Hilbert Function Computations. - Joachim Apel (J. Symb. Comput., 1998)

Zu Berechenbarkeitsfragen der Idealtheorie. - Joachim Apel (1998)

Computational ideal theory in finitely generated extension rings. - Joachim Apel (Theor. Comput. Sci., 2000)

Passive Complete Orthonomic Systems of PDEs and Involutive Bases of Polynomial Modules. - Joachim Apel (SNSC, 2001)

Properties of Entire Functions Over Polynomial Rings via Gröbner Bases. - Joachim Apel; J. Stückrad; P. Tworzewski; T. Winiarski (Appl. Algebra Eng. Commun. Comput., 2003)

Detecting unnecessary reductions in an involutive basis computation. - Joachim Apel; Ralf Hemmecke (J. Symb. Comput., 2005)