Loop Programs and Classes of Primitive Recursive Functions. - Bernhard G. Goetze; Werner Nehrlich (MFCS, 1978)

The Structure of Loop Programs and Subrecursive Hierarchies. - Bernhard G. Goetze; Werner Nehrlich (Math. Log. Q., 1980)

The Number of Loops Necessary and Sufficient for Computing Simple Functions. - Bernhard G. Goetze; Werner Nehrlich (J. Inf. Process. Cybern., 1981)

The Centers of Context-Sensitive Languages. - Ludwig Staiger; Werner Nehrlich (MFCS, 1986)

Construction of Maximal Partial Intervals. - Dimitri W. Kochetkov; Bernhard G. Goetze; Werner Nehrlich (J. Inf. Process. Cybern., 1988)

Maximal Empty Boxes in Higher-dimensional Spaces. - Bernhard G. Goetze; Eduard N. Gordejev; Werner Nehrlich; Dimitri W. Kochetkov (J. Inf. Process. Cybern., 1990)