[2] G. Kaupp, Proceedings of ICCOSS X, the 10th Int. Conf. on the Chem. of the Org. Solid State, Vancouver, July 7-12, 1991,
OC8; Angew Chem. 1992, 104, 606; 609.

[3] G. M. J. Schmidt, J. Chem. Soc. 1964, 2014.

[4] G. Kaupp, Adv. Photochem. 1995, 19, 119.

[5] G. Kaupp, in Comprehensive Supramolecular Chemistry Vol 8 (eds. J. E. D. Davies and J. A. Ripmeester), Elsevier, Oxford, 1996, p. 381-423, with 21 color plates.

[6] G. Kaupp and A. Herrmann, J. Phys. Org. Chem. 1997, 10, in press;
G. Kaupp, A. Herrmann and M. Haak, J. Vac. Sci. Technol. B 1997, in press;
lecture at the NFO-4 in Jerusalem, 13.2.1997, p. 92;
Ultramicroscopy 1997, accepted.

[7] M. Spajer, D. Courjon, K. Sarayeddine, A. Jalocha and J.-M. Vogoureux, J. Phys. (Paris) III 1991, 1, 1.

[8] Scanning Tunneling Microscopy I, II, III (eds. R. Wiesendanger and H.-J. Güntherodt), Springer, Heidelberg, 1992, 1993;
S. N. Magonov, M.-H. Whangbo, Surface Analysis with STM and AFM, VCH, Weinheim, 1996.

[9] I. Stensgaard, E. Laegsgaard and F. Besenbacher, J. Chem. Phys. 1995, 103, 9825.

[10] I. Stensgaard, L. Ruan, E. Laegsgaard and F. Besenbacher, Surf. Sci. 1995, 337, 190.

[11] G. Kaupp in CRC Handbook of Organic Photochemistry and Photobiology (eds. W. M. Horspool and P.-S. Song), CRC, Boca Raton, 1995, p. 50-63.

[12] G. Kaupp and M. Plagmann, J. Photochem. Photobiol. A, 1994, 80, 399.

[13] V. Enkelmann, G. Wegner, K. Novak and K. B. Wagener, J. Am. Chem. Soc. 1993, 115, 10390.

[14] G. Kaupp and M. Haak, footnote 48 in [5].

[15] G. Kaupp and M. Haak, Angew. Chem. 1996, 108, 2948.

[16] (a) G. Kaupp, D. Matthies and C. de Vrese, Chem. Ztg. 1989, 113, 219;
Kohlensäurehalbester-Salze: G. Kaupp, Merck Spectrum 1991, (3),42;
(b) G. Kaupp, U. Pogodda and J. Schmeyers, Chem. Ber. 1994, 127, 2249;
(c) G. Kaupp and U. Pogodda, unpublished.

[17] G. Kaupp and D. Matthies, Chem. Ber. 1987, 120, 1897;
the halogenations of stilbene had difficulties with the detachment of the product; therefore the runs with unmilled stilbene were incomplete and the selectivities were lower (isomer ratios 39:61 and 62:38); after ball milling of trans-stilbene (grain size <1 µm) and calming down of the reaction (0.1 bar Cl₂, -30°C; 0.1 bar Br₂, 20°C) the yield could be increased to 100% and the amount of meso-compound decreased:
G. Kaupp and A. Kuse, Mol. Cryst. Liq. Cryst. submitted.

[18] G. Kaupp, J. Vac. Sci. Technol. B 1994, 12, 1952;
Mol. Cryst. Liq. Cryst. 1994, 242, 153.

[19] G. Kaupp and A. Herrmann, J. pr. Chem./ Chem. Ztg. 1997, 339, 256.

[20] J. Schmeyers, F. Toda, J. Boy and G. Kaupp, J. Chem. Soc. Perkin Trans. 2, submitted.

[21] G. Kaupp, J. Schmeyers, M. Haak, T. Marquardt and A. Herrmann, Mol. Cryst. Liq. Cryst. 1996, 276, 315.

[22] A. Herrmann, G. Kaupp, T. Geue and U. Pietsch, Mol. Cryst. Liq. Cryst. 1997, 239, 261.