His Curves on Cayley's dianodal surface ... 1940.

Elementary matrix algebra, 2002: title page (Franz E. Hohn) back cover (Professor of Mathematics at the University of Illinois for many years)

University of Illinois Department of Mathematics website, viewed October 10, 2018: Franz Hohn and J.P. Nash Fellowship (Franz Edward Hohn; Ph.D., University of Illinois, 1940; University of Illinois faculty, 1948-1977) https://math.illinois.edu/academics/graduate-program/funding/graduate-awards-and-fellowships/franz-hohn-and-jp-nash

OCLC, October 31, 2018 (usage: Franz E. Hohn; Franz Edward Hohn; access point: Hohn, Franz Edward, 1915-1977; Hohn, Franz E.; Hohn, Franz Edward)