Geodesic
On Modular Law for Ternary $GD$-Groupoids
Zbornik radova, Tome 1 (1976) no. 9, p. 53 
Svetozar Milić. On Modular Law for Ternary $GD$-Groupoids. Zbornik radova, Tome 1 (1976) no. 9, p. 53 . http://geodesic.mathdoc.fr/item/ZR_1976_1_9_a8/
@article{ZR_1976_1_9_a8,
     author = {Svetozar Mili\'c},
     title = {On {Modular} {Law} for {Ternary} $GD${-Groupoids}},
     journal = {Zbornik radova},
     pages = {53 },
     year = {1976},
     volume = {1},
     number = {9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZR_1976_1_9_a8/}
}
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Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

Let $X_1,X_2,X_3,X_4$ be four nonempty sets, and $A:X_1imes X_2imes X_3\rightarrow X_4$ then the ordered fivefold $(X_1,X_2,X_3,X_4;A)$ we call $G$-groupoid (generalized ternary groupoid).