Victor F. (Victor Fritz) Lenzen
Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966
Victor F. (Victor Fritz) Lenzen · 2011
ספרייה ציבורית, Project Gutenberg. בלי הרשמה.
Pendulum