Chomskian Hierarchies of Families of Sets of Piecewise Continuous Functions.

Keijo Ruohonen Chomskian Hierarchies of Families of Sets of Piecewise Continuous Functions. 609-638 2004 37 Theory Comput. Syst. 5 http://dx.doi.org/10.1007/s00224-004-1176-0 db/journals/mst/mst37.html#Ruohonen04