Jerzy Tyszkiewicz Fine Hierarchies of Generic Computation. 125-139 ICDT1997/P125.pdf 1997 ICDT db/conf/icdt/icdt97.html#Tyszkiewicz97 conf/icdt/97 http://dx.doi.org/10.1007/3-540-62222-5_41 books/aw/AbiteboulHV95 conf/lics/AbiteboulPV94 conf/stoc/AbiteboulV91 journals/iandc/DawarLW95 ... ... conf/pods/KolaitisV90 conf/lcc/RosenW94 conf/icdt/Tyszkiewicz95 journals/tcs/Tyszkiewicz98