9th World congress on endourology and ESWL : 8th Annual research symposium on ESWL (Methodist Hospital of Indiana, Inc.) : Vienna, Hofburg Congress Centre, 19-22. June 1991 / A. Hamvas
  In: International Urology and Nephrology. - ISSN 0301-1623. - 1992. 24. évf. 1. sz., p. 107-109.