On excision and principal fibrations.
On the homotopy groups of unions of spaces.
Group-Like Structures in General Categories II-Equalizers, Limits, Lengths.
Operators and Cooperators in Homotopy Theory.
Group-Like Structures in General Categories I. Multiplications and Comultiplications.
A natural transformation in homotopy theory and a theorem of G.W. Whitehead.
Filtrations, Associated Graded Objects and Completions.
Homotopy Groups of Maps and Exact Sequences.
Unions and intersectons in Homotopy Theory.
Some Remarks on General Cohomology Theories.
On the Classification Problem for H-Spaces of Rank Two.
On Central Group Extensions and Homology
Composition Functors and Spectral Sequences.
On the chain algebra of a loop space.
Catalan-Zahlen und Wege in einem ganzzahligen Gitter.
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