I am writing an article. I have two sentences. The first sentence introduces a thesis. In the second sentence there is a reference to it. Should I use the relative pronoun "this" or "that" in the second sentence.
Here are my sentences (A and B):
A: It turns out, however, that waveguides having step-index refractive index profile are more favorable because they allow to obtain higher sensitivities.
B: The theoretical prove to this thesis was presented in Ref. [18].
I would use "this thesis". However, I read many artices and it seems that usage of "that thesis" is more common.