Position-Space Renormalization-Group Transformations: Some Proofs and Some Problems
Robert B. Griffiths and Paul A. Pearce
Phys. Rev. Lett. 41, 917 (1978) - Published 2 October, 1978
Time Invariance of Planck's Constant
Ira Wasserman and Kenneth Brecher
Phys. Rev. Lett. 41, 920 (1978) - Published 2 October, 1978