| [1] | Hoffman R C. Stetyick K A. Potembe R S. J V S A. 1989;B6(4),722 |
| [2] | Tutt L W. McCabon S W. Opt Lett. 1990,15(12),700 |
| [3] | Soikau M J. Williama W E. Stryland E W V. IEEE J Q E. 1983,QE-19(4),731 |
| [4] | Iioggexa T F. Moan S C. Doyd L W.Opt,Lett. 1984;9(7),291 |
| [5] | Smith P W. Tomcinnon W J. IEEE J Q E. 1984,QE-20(1),30 |
| [6] | Simoni F. Opt Lett. 1988;13(10),886 |
| [7] | Guha S. Chen W P. Opt Commun. 1987;61(6),425 |
| [8] | Tutt L W. Koat H. Vature. 1992;356(19),225 |