@article{CM_1996__102_2_203_0,
     author = {Neeman, Amnon and Retakh, Vladimir},
     title = {Extension categories and their homotopy},
     journal = {Compositio Mathematica},
     pages = {203--242},
     publisher = {Kluwer Academic Publishers},
     volume = {102},
     number = {2},
     year = {1996},
     mrnumber = {1394526},
     zbl = {0852.18011},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1996__102_2_203_0/}
}