The Stacks project

@UNPUBLISHED{stacks_book,
    AUTHOR = {Behrend, Kai and Conrad, Brian and Edidin, Dan and Fantechi, Barbara and Fulton, William and G{\"o}ttsche, Lothar and Kresch, Andrew},
    TITLE = "Algebraic stacks",
    URL = "https://www.math.uzh.ch/index.php?pr\_vo\_det\&key1=1287\&key2=580\&no\_cache=1",
    YEAR = "2007"
}