1. Relativizations of the P=?NP question;Baker;SIAM J. Comput.,1975
2. On the computational complexity of maximation and integration;Friedman;Adv. in Appl. Math.,1984
3. Some approaches to constructive analysis;Grzegorczyk,1959
4. A comparison of polynomial time reducibilities;Ladner;Theoret. Comput. Sci.,1975
5. On NP real functions;Ko,1981