Melendez-Lopez, A. L.; Ramos-Bernal, S. .; Negron-Mendoza, A. Stability of Aspartic Acid at 77°K under Gamma Radiation in a Comet Cores Simulation: Implications for Chemical Evolution Studies. J. Nucl. Phy. Mat. Sci. Rad. A. 2016, 4, 191-201.