%0 Journal Article %T Next-to-Next-to-Leading Order Calculation of Valence Quark Polarization in the Valon Model %A Taghavi Shahri, Seyyedeh Fatemeh %A Alizadeh Yazdi, Zahra %A Shahin Atashbar Tehrani %J International Journal of Theoretical Physics %@ 0020-7748 %D 2019