Geodesic multiplication and geodesic translations as a generalization of Poincare shiftsKuusk, Piret; Örd, Jüri; Paal, Eugen15th International Conference on General Relativity and Gravitation, Pune, India, 16.-21. December 1997 : abstracts1998 / [1] p Some remarks on relativistically invariant equationsLoide, Rein-Karl1972 https://www.ester.ee/record=b1356354*est