found: On behavior of solutions of partial differential equations, 1953.
found: 75 years of radon transform, c1994:p. 2 (Fritz John; d. Feb. 10, 1994)
found: Introduction to calculus and analysis, 2000:CIP t.p. (Fritz John) d.s. (dob and death: 1910-1994)
found: New York times, Aug. 15, 2013obit. dated Feb. 12, 1994 (Dr. Fritz John, who charted new paths in mathematics as a leading expert on partial differential equations, died on Thursday at his home in New Rochelle, N.Y. Dr. John was born in Berlin in 1910 and received his Ph.D. from the University of Gottingen in 1933. He came to the United States in 1935 as an assistant professor at the University of Kentucky. He was a member of the National Academy of Sciences and held the Courant Chair at the Courant Institute from 1976 until he retired in 1981) - http://www.nytimes.com/1994/02/12/obituaries/fritz-john-a-master-mathematician-dies-at-83.html found: Introducción al cálculo y al análisis matemático, 1971:title page (Fritz John; courant Institute of Mathematica: Sciences, University of New York)
