Ashish V. Naik Alan L. Selman A Note on P-selective sets and on Adaptive versus Nonadaptive Queries to NP. 224-232 http://doi.ieeecomputersociety.org/10.1109/CCC.1996.507684 1996 conf/coco/1996 IEEE Conference on Computational Complexity db/conf/coco/coco96.html#NaikS96