no. 1
Monoidal structures on graded categories
Cahiers de topologie et géométrie différentielle, Tome 23 (1982) no. 1, pp. 43-45 
@article{CTGDC_1982__23_1_43_0,
     author = {Mitchell, Barry},
     title = {Monoidal structures on graded categories},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {43--45},
     year = {1982},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {23},
     number = {1},
     mrnumber = {648794},
     zbl = {0493.18003},
     language = {en},
     url = {https://www.numdam.org/item/CTGDC_1982__23_1_43_0/}
}
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Mitchell, Barry. Monoidal structures on graded categories. Cahiers de topologie et géométrie différentielle, Tome 23 (1982) no. 1, pp. 43-45. https://www.numdam.org/item/CTGDC_1982__23_1_43_0/

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3 S. Mac Lane, Homology, Springer, Berlin, 1963. | Zbl | MR

4 S. Mac Lane, Natural associativity and commutativity, Rice University Studies 49 (1963), N° 4, 28 - 46. | Zbl | MR

5 B. Mitchell, Low dimensional group cohomology as monoidal structures. To appear in American J. of Mathematics. | Zbl | MR