The University of Liverpool
Patent: US5675020 A1, 1997 ;

Gonzalez-Rodriguez, David; Carbonell, Esther; Rojas, Gustavo De Miguel; Castellanos, Carmen Atienza; Guldi, Dirk M.; Torres, Tomas
Journal of the American Chemical Society, 2010 , vol. 132, # 46 p. 16488 - 16500

Blikova; Ivanov; Tomilova; Shvedene
Russian Chemical Bulletin, 2003 , vol. 52, # 1 p. 150 - 153