@article{v009a020, author = {Sherstov, Alexander A.}, title = {Approximating the AND-OR Tree}, year = {2013}, pages = {653--663}, doi = {10.4086/toc.2013.v009a020}, publisher = {Theory of Computing}, journal = {Theory of Computing}, volume = {9}, number = {20}, URL = {https://theoryofcomputing.org/articles/v009a020}, }