By Achasov N.   Kozhevnikov A.   in Journal of Experimental and Theoretical Physics

ISSN:1063-7761|91|3|433-448

MAIK Nauka/Interperiodica‎(2000)‎

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By Achasov N.   Shestakov G.   in JETP Letters

ISSN:0021-3640|94|1|11-17

MAIK Nauka/Interperiodica‎(2011)‎

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