%0 Journal Article %A Jörg Koppitz, %A Tiwadee Musunthia %T Hypersubstitutions for varieties of rings %J Novi Sad Journal of Mathematics %D 2010 %P 55-65 %V 40 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/NSJOM_2010_40_2a_15/ %F NSJOM_2010_40_2a_15