Sophus Lie
Baron Georges Cuvier
Eisenhart, Luther Pfahler
Jean Mariani
John De Cicco
Peter Wilker
William Taylor Putney
Harold Ward Crowley
Franz Joseph Dohmen
Philipp Engelhardt
Friedrich Fitting
Richard Rassmann
Robert M. Miura
Friedrich Dörr
Unknown Author
Heinrich Liebmann
NSF Research Workshop on Contact Transformations Vanderbilt University 1974.
Jacques Dutka
Walther Asmus Christian Brügmann