1. s A;Little;Phys Rev Chem Phys Chem Phys Chem Soc,1964
2. ( b anorg u allgem and Princeton Univ Solids Princeton van Roggen For pertinent reviews see ( a Dessauer In Photographie Science Symposium Zurich;Goehring;Naturwiss Chem Quart Rev Chem Phys Trans Farad Soc Am Chem Soc Physik Bull Chem Soc Japan Proc Semicand Mol Bull Chem Soc Japan Phys Rev Letters,1953