Sanjay Jain Efim B. Kinber Christophe Papazian Carl H. Smith Rolf Wiehagen On the intrinsic complexity of learning recursive functions. 45-70 2003 184 Inf. Comput. 1 http://dx.doi.org/10.1016/S0890-5401(03)00059-2 db/journals/iandc/iandc184.html#JainKPSW03