Article 2338 N. H. Hakobyan V. M. Aroutiounian H. L. Margaryan V. K. Abrahamyan V. G. Babajanyan D. L. Hovhannisyan A. T. Poghosyan D. K. Pokhsraryan Journal of Contemporary Physics (Armenian Academy of Sciences) Vol. 44, No. 2 84–90 2009 http://www.springer.com/physics/particle+and+nuclear+physics/journal/11958