@ARTICLE{My1982, author = {My, Nguyen Xuan and Istrail, Sorin}, title = {N-contextual schemes}, journal = {Bulletin Mathematique}, year = {1982}, volume = {Tome 26 (74)}, pages = {241--249}, number = {3}, owner = {Derek}, timestamp = {2012.05.08}, category = {Theory of Computation} }