Geodesic
The matrix equation a(x...y) = a(x)+a(x)a(y)+a(y). (Short Communication).
Aequationes mathematicae, Tome 14 (1976), pp. 514-515 
M.A. McKiernan. The matrix equation a(x...y) = a(x)+a(x)a(y)+a(y). (Short Communication).. Aequationes mathematicae, Tome 14 (1976), pp. 514-515. http://geodesic.mathdoc.fr/item/AM2_1976__14_136623/
@article{AM2_1976__14_136623,
     author = {M.A. McKiernan},
     title = {The matrix equation a(x...y) = a(x)+a(x)a(y)+a(y). {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {514--515},
     year = {1976},
     volume = {14},
     url = {http://geodesic.mathdoc.fr/item/AM2_1976__14_136623/}
}
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