Geodesic
Gabriel's theorem is also true for representations of equipped graphs by relations
Funkcionalʹnyj analiz i ego priloženiâ, Tome 15 (1981) no. 2, pp. 71-72.

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     title = {Gabriel's theorem is also true for representations of equipped graphs by relations},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
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     year = {1981},
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I. M. Gel'fand; V. A. Ponomarev. Gabriel's theorem is also true for representations of equipped graphs by relations. Funkcionalʹnyj analiz i ego priloženiâ, Tome 15 (1981) no. 2, pp. 71-72. http://geodesic.mathdoc.fr/item/FAA_1981_15_2_a9/

[1] Gabriel P., “Unzerlegbare Darstellungen”, Manuscripta Math., 6 (1972), 71–103 | DOI | MR | Zbl

[2] Bernshtein I.N., Gelfand I.M., Ponomarev V.A., UMN, XXVIII:2 (1973), 19–33

[3] Maclane S., Proc. NAS USA, 47 (1961), 1043–1051 | DOI | MR | Zbl