On Markov Properties Of Finitely Presented Groups Nataša B. Božović (1977) Publications de l'Institut Mathématique
On Markov properties of finitely presented groups. N.B. Bozovic (1977) Publications de l'Institut Mathématique [Elektronische Ressource]
On the Goldbach conjecture and the consistency of general recursive arithemetic. H.A. Pogorzelski (1974) Journal für die reine und angewandte Mathematik