Schopper H. F., . (1966). Weak interactions and nuclear beta decay. [s.l.]: [s.n.].
Schopper H F, . 1966. Weak interactions and nuclear beta decay. [s.l.]: [s.n.].
Schopper H F, . Weak interactions and nuclear beta decay. [s.l.]: [s.n.]. 1966.