American Journal of Physics
Newtonian acceleration is considered in the light of special relativity theory with the result that the component of acceleration in the direction of an arbitrary applied force is always positive.(AIP)
Lock, James A., "Negative Acceleration Components for a Relativistic Particle" (1981). Physics Faculty Publications. 134.
Lock, James A. "Negative Acceleration Components for a Relativistic Particle." American Journal of Physics 49 (1981): 693-694.
Copyright 1981 American Association of Physics Teachers. The article appeared in American Journal of Physics 49 (1981): 693-694 and may be found at http://aapt.scitation.org/doi/10.1119/1.12431