On the a.e. convergence of convolution integrals and related problems W. B. Jurkat; G. Sampson — 1981 Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
A reduction theory of second order meromorphic differential equations. II W. B. Jurkat; H. J. Zwiesler — 1988 Annales scientifiques de l'École Normale Supérieure