This is the presentation by Geert Vanden Bossche, DVM, PhD about the risk of “viral escape” posed by “leaky vaccines.”
The theoretical article he is referring to is: https://journals.plos.org/plosbiology/article?id=10.1371%2Fjournal.pbio.1002198
You can find many more info and references on his website: https://www.geertvandenbossche.org/
See more at https://covexit.com