Charlton, M., Fabrikant, I. I., Kadyrov, A. S., Bray, I., & Charlton, M. (2017). Low-energy l-mixing collisions of excited positronium with protons and antiprotons. Journal of Physics B: Atomic, Molecular and Optical Physics, 50(13), p. 134001. doi:10.1088/1361-6455/aa743c

Charlton, Michael, I I. Fabrikant, A S. Kadyrov, I. Bray, and M. Charlton. "Low-energy L-mixing Collisions of Excited Positronium With Protons and Antiprotons." Journal of Physics B: Atomic, Molecular and Optical Physics 50, no. 13 (2017): 134001.

Charlton, Michael, et al. "Low-energy L-mixing Collisions of Excited Positronium With Protons and Antiprotons." Journal of Physics B: Atomic, Molecular and Optical Physics 50.13 (2017): 134001.