Geodesic
Plane functors
Matematičeskie zametki, Tome 19 (1976) no. 4, pp. 577-586.

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Tensor products of functors over the set category are studied in this work. The concept of a plane functor is defined and a criterion under which a functor is planar is given, by means of which the existence of injective envelopes in the functor category over the set category is proved. 
@article{MZM_1976_19_4_a10,
     author = {E. B. Katsov},
     title = {Plane functors},
     journal = {Matemati\v{c}eskie zametki},
     pages = {577--586},
     publisher = {mathdoc},
     volume = {19},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_19_4_a10/}
}
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E. B. Katsov. Plane functors. Matematičeskie zametki, Tome 19 (1976) no. 4, pp. 577-586. http://geodesic.mathdoc.fr/item/MZM_1976_19_4_a10/