Pahl, A., Fendel, P., Henrich, B. R., Walz, J., Hänsch, T. W., & Eikema, K. S. E. (2005). Generation of Continuous Coherent Radiation at Lyman-α and 1S-2P Spectroscopy of Atomic Hydrogen. Special Issue Dedicated to Professor Herbert Walther on His 70th Birth Anniversary, 46-54. Retrieved from http://www.maik.ru/cgi-bin/search.pl?type=abstract&name=lasphys&number=1&year=5&page=46.