Geodesic
Retracts of structures
Matematičeskie zametki, Tome 7 (1970) no. 6, pp. 687-692.

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It is proved that the category of all structures does not contain nontrivial injective objects. Necessary and sufficient conditions are derived under which any substructure (ideal, filter) of a structure $L$ is a retract of $L$. 
@article{MZM_1970_7_6_a3,
     author = {T. S. Fofanova},
     title = {Retracts of structures},
     journal = {Matemati\v{c}eskie zametki},
     pages = {687--692},
     publisher = {mathdoc},
     volume = {7},
     number = {6},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_6_a3/}
}
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T. S. Fofanova. Retracts of structures. Matematičeskie zametki, Tome 7 (1970) no. 6, pp. 687-692. http://geodesic.mathdoc.fr/item/MZM_1970_7_6_a3/