1. Fujii, K., Inoue, A.Namba, T. 2003.Proc. GLOBAL 03756New Orleans, USA
2. Bychkov, A. V., Skiba, O. V.Porodnov, P. T. 1995.Proc. GLOBAL 95516–523. Versailles, France
3. Kormilitsyn, M. V., Bychkov, A. V. and Ishunin, V. S. 2003.Proc. GLOBAL 03782New Orleans, USA
4. Private communication with M. V. Kormilitsyn.