1. Ein allgemeines Prinzip bezüglich Komitanten, Differentialkomitanten, kovarianten Ableitungen und Algebren von äquivalenten geometrischen Objekten;Aczél;Acta Classica Universitas Scientiarum Debreceniensis,1959
2. Dimensional analysis in relativistic gravitational theories;Aldersley;Physical Review D,1977
3. Absolute change in general relativity;Anderson,1962
4. Principles of relativity physics;Anderson,1967
5. Mass positivity from focussing and the structure of io;Ashtekar;Twistor Newsletter,1990