Artificial Radioactivity Produced by Neutron Bombardment
Cosmic Radiation and Cosmic Magnetic Fields. II. Origin of Cosmic Magnetic Fields
- Biermann, Ludwig; Schlüter, Arnulf (Max-Planck-Institut für Physik, Göttingen, Germany)
Can One Hear the Shape of a Drum?
- Mark Kac (The Rockefeller University, New York)