Erich Kaltofen in Dec 2024 (Durham, NC, USA)
Erich Kaltofen in April 2020 (Cary, NC, USA)
Erich Kaltofen in November 2013 (St. Florian, Austria)
Erich Kaltofen and Stephen Wolfram in July 2018 (New York, NY)
Erich Kaltofen in July 2007 (Saigon, Vietnam)
Erich Kaltofen in July 2008 (Hagenberg, Austria)
Erich Kaltofen, George E. Collins [Jan 10, 1928-Nov 21, 2017],
Bobby F. Caviness [Mar 24, 1940-Jan 11, 2018] in September 2009 (Raleigh, USA)