1. English Translation: Who I am, I know not. Whence I come, I know not. Whither I go, I know not. Yet this astonishing joy! Angelus Silesius
2. P.-O. Löwdin, Some Aspects on the Research Process in the Natural Sciences in Scientists at work: Festschrift in honour ofHerman Wold, edited by T. Dalenius, G. Karlsson, and S. Malmquist (Almqvist & Wiksell, Stockholm, 1970), pp. 112.
3. P.-O. Löwdin, Advances in Quantum Chemistry 8, 323 (1967).
4. M. Quack, Die Symmetrie von Zeit und Raum und ihre Verletzung in molekularen Prozessen in Jahrbuch 1990–1992 der Akademie der Wissenschaften zu Berlin (W. de Gruyter Verlag, Berlin, 1993), pp. 467, (printed version of the 8th public academy lecture, Berlin 4.10.1990); there exists also a slightly changed English version: M. Quack, The symmetries of time and space and their violation in chiral molecules and molecular processes, pp. 172, in Conceptual Tools for Understanding Nature. Proc. 2nd Int. Symp. of Science and Epistemology Seminar, Trieste April 1993, edited by G. Costa, G. Calucci, M. Giorgi, (World Scientific Publ., Singapore, 1995).
5. M. Quack, Molecular femtosecond quantum dynamics between less than yoctoseconds and more than days: Experiment and theory, Chapter 27 in Femtosecond chemistry, Proc. Berlin Conf. Femtosecond Chemistry, Berlin (March 1993), edited by J. Manz and L. Woeste (Verlag Chemie, Weinheim, 1995), pp. 781.