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Wiktionary:
regression testing
(software engineering) testing a program after a modification to ensure that areas that should not be affected by the update behave as they did in previous versions

ISO/IEC 27034:
testimine, mis on vajalik otsustamiseks, et süsteemikomponent pole kahjulikult mõjutanud
funktsioone, töökindlust või sooritusvõimet
ega ole lisanud uusi defekte
= testing required to determine that a change to a system component has not adversely affected functionality, reliability or performance and has not introduced additional defects

ISO/IEC/IEEE 24765:
kordustestimine muudatuste tekitatud defektide avastamiseks
= retesting to detect faults introduced by modification

ülevaateid
https://huddle.eurostarsoftwaretesting.com/the-difference-between-regression-testing-and-retesting/

https://www.lth.se/fileadmin/programvaruportal/LD2010/B4.pdf

https://en.wikipedia.org/wiki/Regression_testing

https://arxiv.org/pdf/1903.03676.pdf

https://www.uio.no/studier/emner/matnat/ifi/nedlagte-emner/INF4290/v11/undervisningsmateriale/INF4290-RegTest.pdf

https://www.janbasktraining.com/blog/regression-testing-tutorial/

https://www.sealights.io/regression-testing/regression-testing-in-agile-concepts-challenges-and-strategies/

https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.460.5875&rep=rep1&type=pdf

https://arxiv.org/pdf/1903.03676.pdf