By Naydenova I.   Petrova T.   Tomova N.   Dragostinova V.   Nikolova L.   Todorov T.   in Pure and Applied Optics: Journal of the European Optical Society Part A

ISSN:0963-9659|7|4|723-731

IOP Publishing‎(1998)‎

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By Ivanov M.   Naydenova I.   Todorov T.   Nikolova L.   Petrova T.   Tomova N.   Dragostinova V.   in Journal of Modern Optics

ISSN:1362-3044|47|5|861-867

Taylor & Francis Ltd‎(2000)‎

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