@inproceedings{Stearns_1965,
    doi = {10.1109/focs.1965.11},
    url = {https://doi.org/10.1109%2Ffocs.1965.11},
    year = {1965},
    publisher = {{IEEE}},
    author = {R. E. Stearns and J. Hartmanis and P. M. Lewis},
    title = {Hierarchies of memory limited computations},
    booktitle = {6th Annual Symposium on Switching Circuit Theory and Logical Design ({SWCT} 1965)}
}

@inproceedings{Stearns_1965, doi = {10.1109/focs.1965.11}, url = {https://doi.org/10.1109%2Ffocs.1965.11}, year = {1965}, publisher = {{IEEE}}, author = {R. E. Stearns and J. Hartmanis and P. M. Lewis}, title = {Hierarchies of memory limited computations}, booktitle = {6th Annual Symposium on Switching Circuit Theory and Logical Design ({SWCT} 1965)} }