1. Agüiero A., Algaba J.M., Alvarez J., Garcia de Blas F.J., Sanchez-Pascual A., Torre Albarsang M. de la and Vallés P., Proc. Int. Conf. on Metallurgical Coatings and Thin Films, San Diego (1997)
2. Anderson A.I., Ellis T., Goldman A.I., McCallum R.W., Shield J.E. and Sordelet D.J., US Patent no. 5433978 (1995)
3. Archambault P., in “New Horizons in Quasicrystals: Research and Applications”, Goldman A.I., Sordelet D.J., Thiel P.A. and Dubois J.M. (Eds), World Scientific, Singapore (1997) p. 232
4. Bak P., Phys. Rev. Lett. 56 (1986) 861
5. Basov D.N., Timusk T., Barakat F., Greedan J. and Grushko B., Phys. Rev. Lett. 72–12 (1994) 1937.