Villard, Paul Ulrich, author.
[Identification of Gamma Radiation / by Paul Ulrich Villard.]
These two papers describe Villard's discovery of gamma rays in 1900. The name of these rays was given in 1903 by E. Rutherford.
Gamma rays.
Sur la rf̌lexion et la rf̌raction de rayons cathodiques et des rayons dv̌iables du radium.
Sur le rayonnement du radium.