Limites projectives et approximation. Limites inductives
Compositio Mathematica, Tome 30 (1975) no. 3, pp. 323-336. 
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     author = {Bertin, E. M. J.},
     title = {Limites projectives et approximation. {Limites} inductives},
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     pages = {323--336},
     publisher = {Noordhoff International Publishing},
     volume = {30},
     number = {3},
     year = {1975},
     mrnumber = {374229},
     zbl = {0314.18002},
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     url = {http://archive.numdam.org/item/CM_1975__30_3_323_0/}
}
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Bertin, E. M. J. Limites projectives et approximation. Limites inductives. Compositio Mathematica, Tome 30 (1975) no. 3, pp. 323-336. http://archive.numdam.org/item/CM_1975__30_3_323_0/

[1] E.M.J. Bertin: Limites projectives et approximation. Théorie élémentaire. Comp. Math. 23 (1971) 357-378. | Numdam | MR | Zbl

[2] B. Mitchell: Theory of categories. Academic Press, New York 1965. | MR | Zbl