Tao Jiang, Joel I. Seiferas, Paul M. B. Vitányi. Two heads are better than two tapes. Journal of the ACM, 44(2):237-256, 1997. [doi]
@article{JiangSV97,
title = {Two heads are better than two tapes},
author = {Tao Jiang and Joel I. Seiferas and Paul M. B. Vitányi},
year = {1997},
doi = {10.1145/256303.256308},
url = {http://doi.acm.org/10.1145/256303.256308},
researchr = {https://researchr.org/publication/JiangSV97},
cites = {0},
citedby = {0},
journal = {Journal of the ACM},
volume = {44},
number = {2},
pages = {237-256},
}