Ashton, Peter R.; Ballardini, Roberto; Balzani, Vincenzo; Constable, Edwin C.; Credi, Alberto; Kocian, Oldrich; Langford, Steven J.; Preece, Jon A.; Prodi, Luca; Schofield, Emma R.; Spencer, Neil; Stoddart, J. Fraser; Wenger, Sabine Chemistry - A European Journal, 1998 , vol. 4, # 12 p. 2413 - 2422