1. there in;Kalinin;Strukt Khim,1975
2. Abstract;Munoz;chem Vol Letters,1979
3. ibid ibid ibid;Segall;Am Chem Soc,1978
4. personal communication et al to be published personal communication;Pfister;Chem Soc Chem Comm,1969
5. Under press;Savignac;Organomet Chem,1979