. Helv and . Phys, Acta Suppl, p.97, 1950.

P. W. L-e-t-t-e-r, ) t o a meeting of p h y s i c i s t s , among which H. GEIGER and L. MEITNER, t a k i n g p l a c e i n Tubingen. The l e t t e r was conserved by k i t n e r and i t s c o n t e n t was d i s c u s s e d s i n c e 1930, Physics Today, p.23, 1930.

/. W. Pauli, Septisme Conseil d e Physique Solvay, p.324, 1933.

/. Fermi-e, Ricerca S c i e n t i f i c a L, 1933.

/. E. Proc and . Am, P h i l . Soc. 93 (1949) 521, s e e a l s o STUCKF

W. E. Phys, Acta -11 (1939) 225, Z. Phys, vol.2, issue.330, 1929.

. Phys, Acta r e f

/. B. Pontecorvo and R. B. Pontecorvo, JETP x ( 1 9 5 9 ) 1751, Proc.Kiev I n t . High Energy Phys, p.233, 1411.