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IEEE Photonics Technology Letters > 1997 > 9 > 11 > 1472 - 1474
Proceedings of European Conference on Optical Communication > 2 > 119 - 122 vol.2
Electronics Letters > 1992 > 28 > 22 > 2040 - 2041
Electronics Letters > 1987 > 23 > 10 > 501 - 502