Henryk Kotlarski Bozena Piekart Andreas Weiermann More on lower bounds for partitioning alpha-large sets. 113-126 2007 147 Ann. Pure Appl. Logic 3 http://dx.doi.org/10.1016/j.apal.2006.04.004 db/journals/apal/apal147.html#KotlarskiPW07