Robert Rettinger Klaus Weihrauch Ning Zhong 0002 Complexity of Blowup Problems: Extended Abstract. 219-230 2008 221 Electr. Notes Theor. Comput. Sci. http://dx.doi.org/10.1016/j.entcs.2008.12.019 db/journals/entcs/entcs221.html#RettingerWZ08