Christopher Umans. Hardness of Approximating Sigma::2:::::p::: Minimization Problems. In FOCS. pages 465-474, 1999. [doi]
@inproceedings{Umans99, title = {Hardness of Approximating Sigma::2:::::p::: Minimization Problems}, author = {Christopher Umans}, year = {1999}, url = {http://computer.org/proceedings/focs/0409/04090465abs.htm}, researchr = {https://researchr.org/publication/Umans99}, cites = {0}, citedby = {0}, pages = {465-474}, booktitle = {FOCS}, }