Alexander B. Bichkov and Valery V. Smirnov, Evaluation of Total Cross Section of Photo-Ionization of Helium in Weak Field on Base of Trajectory Method. journal = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology. October 2013, vol. 83(11). 1556 - 1558 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/17248.