Geodesic
A Construction of Subequalizers
Canadian mathematical bulletin, Tome 16 (1973) no. 3, p. 433

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DOI

Given a pair of functors F, G:A→B, Lambek defines [1] the subequalizing category, E of (F, G) as the category with objects, ordered pairs (A, b) with A ∈ |A| and b:FA→GA a morphism of B. The morphisms of E from (A, b) to (A′, b′) are ordered triples (b, a, b′) where a:A→A′ is a morphism of A and G(a)b = b′F(a). 
Coppotelli, Fred. A Construction of Subequalizers. Canadian mathematical bulletin, Tome 16 (1973) no. 3, p. 433. doi: 10.4153/CMB-1973-068-4
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     title = {A {Construction} of {Subequalizers}},
     journal = {Canadian mathematical bulletin},
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     year = {1973},
     volume = {16},
     number = {3},
     doi = {10.4153/CMB-1973-068-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1973-068-4/}
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