1. Fano, U., Prats, F.: J. Natl. Acad. Sci. (India) A33, 533 (1963). As regards early applications to atomic photoionization using the configuration-interaction in the continuum approach, see the reviews by Altick, P.L.: In: Excited states in quantum chemistry. Nicolaides, C.A., Beck, D.R. (eds.), p. 361. Dordrecht, Boston, Lancaster: Reidel 1978; Starace, A.F.: In: Encyclopedia of Physics. Vol. 31: Corpuscles and radiation in matter I. Mehlhorn, W. (ed.), p. 1. Berlin, Heidelberg, New York: Springer-Verlag 1982
2. Ramaker, D.E., Schrader, D.M.: Phys. Rev. A9, 1980 (1974)
3. Burke, P.G., Robb, D.: Adv. At. Mol. Phys.11, 144 (1975)
4. E.g.: Shell model approach to nuclear reactions. Mahaux, C., Weidenmüller, H.A. (eds.). Amsterdam: North-Holland 1969. In this book, material and original references on theR-matrix,K-matrix, eigenchannel and related formalisms can be found
5. Fano, U.: J. Opt. Soc. Am.65, 979 (1975)