1. West R, Fink MJ, Michl J (1981) Science 214:1343
2. For reviews: (a) Okazaki R, West R (1996) Adv Organomet Chem 39:231. (b) Power PP (1999) Chem Rev 99:3463. (c) Kira M, Iwamoto T (2006) Adv Organomet Chem 54:73. (d) Wang Y, Robinson GH (2009) Chem Commun 5201. (e) Fischer RC, Power PP (2010) Chem Rev 110:4877. (f) Lee YV, Sekiguchi A (2010) Organometallic compounds of low-coordinate Si, Ge, Sn and Pb. Wiley, Chichester (g) Scheschkewitz D (2011) Chem Lett 40:2 (h) Asay M, Sekiguchi A (2012) Bull Chem Soc Jpn 85:1245. (i) Sasamori T, Tokitoh N, Bull Chem Soc Jpn 86:1005
3. Wakita K, Tokitoh N, Okazaki R, Nagase S (2000) Angew Chem Int Ed 39:634
4. Ishida S, Iwamoto T, Kabuto C, Kira M (2003) Nature 421:725
5. Sekiguchi A, Kinjo R, Ichinohe M (2004) Science 305:1755