Author/Authors :
ASADIAN, N. ferdowsi university of mashhad - School of Mathematical Sciences - Department of Statistics, مشهد, ايران , FAKOOR, V. ferdowsi university of mashhad - School of Mathematical Sciences - Department of Statistics, مشهد, ايران , BOZORGNIA, A. ferdowsi university of mashhad - School of Mathematical Sciences - Department of Statistics, مشهد, ايران