@article{CM_1974__28_3_229_0,
     author = {Fr\"ohlich, A. and Wall, C. T. C.},
     title = {Graded monoidal categories},
     journal = {Compositio Mathematica},
     pages = {229--285},
     publisher = {Noordhoff International Publishing},
     volume = {28},
     number = {3},
     year = {1974},
     mrnumber = {349804},
     zbl = {0327.18007},
     language = {en},
     url = {http://www.numdam.org/item/CM_1974__28_3_229_0/}
}