@article{Ruzzo_1984,
    doi = {10.1016/0022-0000(84)90066-7},
    url = {https://doi.org/10.1016%2F0022-0000%2884%2990066-7},
    year = {1984},
    month = {apr},
    publisher = {Elsevier {BV}},
    volume = {28},
    number = {2},
    pages = {216--230},
    author = {Walter L. Ruzzo and Janos Simon and Martin Tompa},
    title = {Space-bounded hierarchies and probabilistic computations},
    journal = {Journal of Computer and System Sciences}
}

@article{Ruzzo_1984, doi = {10.1016/0022-0000(84)90066-7}, url = {https://doi.org/10.1016%2F0022-0000%2884%2990066-7}, year = {1984}, month = {apr}, publisher = {Elsevier {BV}}, volume = {28}, number = {2}, pages = {216--230}, author = {Walter L. Ruzzo and Janos Simon and Martin Tompa}, title = {Space-bounded hierarchies and probabilistic computations}, journal = {Journal of Computer and System Sciences} }