José L. Balcázar, Uwe Schöning. Bi-Immune Sets for Complexity Classes. Theory Comput. Syst., 18(1):1-10, 1985.
@article{BalcazarS85, title = {Bi-Immune Sets for Complexity Classes}, author = {José L. Balcázar and Uwe Schöning}, year = {1985}, researchr = {https://researchr.org/publication/BalcazarS85}, cites = {0}, citedby = {0}, journal = {Theory Comput. Syst.}, volume = {18}, number = {1}, pages = {1-10}, }