@Article{ MARTINEZ_AZNAR:197-250,
author = { ANTONIO MARTINEZ CEGARRA and ENRIQUE RAFAEL AZNAR GARCÍA } ,
title = { An exact sequence in the first variable for torsor cohomology: the 2-dimensional theory of obstructions },
journal = { Journal of Pure and Applied Algebra },
year = { 1986 },
volume = { 39 },
pages = { 197-250 },
doi = { http://www.journals.elsevier.com/journal-of-pure-and-applied-algebra/ },
}