Beggs, E., Beggs, E., Costa, J. F., Loff, B., Tucker, J., & Tucker, J. (2009). Computational complexity with experiments as oracles. II. Upper bounds. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 465(2105), pp. 1453-1465. doi:10.1098/rspa.2008.0412

Beggs, Edwin, E. Beggs, J. F. Costa, B. Loff, J.V Tucker, and John Tucker. "Computational Complexity With Experiments As Oracles. II. Upper Bounds." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 465, no. 2105 (2009): 1453-1465.

Beggs, Edwin, et al. "Computational Complexity With Experiments As Oracles. II. Upper Bounds." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 465.2105 (2009): 1453-1465.