%0 Journal Article %T Spin Filtering of Stored (Anti)Protons: from FILTEX to COSY to AD to FAIR %A Nikolaev %A N. %A Pavlov %A F. %J High Energy Physics - Phenomenology %D 2007 %I %R 10.1063/1.2750928 %X We review the theory of spin filtering of stored (anti)protons by multiple passage through the polarized internal target (PIT). Implications for the antiproton polarization buildup in the proposed PAX experiment at FAIR GSI are discussed. %U http://arxiv.org/abs/hep-ph/0701175