Walker, Helen M. |
The relation of Plana and Bravais to theory of correlation / Helen M. Walker |
In: Isis Vol. 10 (1928), p. 466-484 |
Walker, Helen M. |
An unpublished hydraulic experiment of Roberval (1668) / Helen M. Walker |
In: Osiris Vol. 1 (1936), p. 726-732, Numero monografico dal tit.: A volume of studies on the history of mathematics and the history of science presented to David Eugene Smith on his 76th birthday, Jan. 21, 1936 / edited by George Sarton |