Author: Urs Format: MarkdownItexadded pointer to:
* [[Peter Hilton]], [[Urs Stammbach]], Section I.9 in: _A course in homological algebra_, Springer-Verlag, New York, 1971, Graduate Texts in Mathematics, Vol. 4 ([doi](https://link.springer.com/book/10.1007/978-1-4419-8566-8), [pdf](https://web.math.rochester.edu/people/faculty/doug/otherpapers/hilton-stammbach.pdf))
<a href="https://ncatlab.org/nlab/revision/diff/injective+envelope/14">diff</a>, <a href="https://ncatlab.org/nlab/revision/injective+envelope/14">v14</a>, <a href="https://ncatlab.org/nlab/show/injective+envelope">current</a>
added pointer to:
Peter Hilton, Urs Stammbach, Section I.9 in: A course in homological algebra, Springer-Verlag, New York, 1971, Graduate Texts in Mathematics, Vol. 4 (doi, pdf)