Ronald P. Gruber

The impossibility of a simple derivation of the Schwarzschild metric

Ronald P. Gruber, R. Price, Stephen M. Matthews, 1988 .

Clock asynchrony and mass variation

Ronald P. Gruber, D. Brahm, 1993 .

Zero time dilation in an accelerating rocket

Ronald P. Gruber, R. Price, 1997 .

Landing the uniformly accelerating observers

Ronald P. Gruber, B. Rothenstein, S. Popescu, 2006, physics/0610226.