Hans Heller. Relativized Polynomial Hierarchies Extending Two Levels. Theory Comput. Syst., 17(2):71-84, 1984.
@article{Heller84,
title = {Relativized Polynomial Hierarchies Extending Two Levels},
author = {Hans Heller},
year = {1984},
researchr = {https://researchr.org/publication/Heller84},
cites = {0},
citedby = {0},
journal = {Theory Comput. Syst.},
volume = {17},
number = {2},
pages = {71-84},
}