1 S.J. Smith, J.H. Eberly, and J.W. Gallagher, Multiphoton Bibliography 1983-1986 (University of Colorado and University of Rochester, Boulder, 1989), p. 272.
1 S.J. Smith, and P.L. Knight, 4th International Conference on Multiphoton Processes Volume 8 of Cambridge Iberian and Latin American Studies; Issue 8 of Cambridge Studies in Modern Optics, (1988).