1. R.L. Fork, B.I. Green, C.V. Shank: Appl. Phys. Lett.38, 671 (1981)
2. C.V. Shank, R.L. Fork, R.T. Yen, R.H. Stolen, W.I. Tomlinson: Appl. Phys. Lett.40, 761 (1982)
3. J.-C. Diels, J.J. Fontaine, I.C. McMichael, B. Wilhelmi, W. Dietel, D. Kühlke, W. Rudolph: Kvantovaya Elektron10, 2398 (1983) (papers presented at the National Conference on Coherent and Nonlinear Optics, Jerevan 1982)
4. W. Dietel, W. Rudolph, B. Wilhelmi, J.-C. Diels, J.J. Fontaine: Proc. 3rd Conf. Ultrashort Phenomena in Spectroscopy, Minsk (1983)
5. J.A. Armstrong, E. Courtens: IEEE J. QE-5, 249 (1969)