How should I refer to my master's thesis in its text? A paper? Occasionally I need to refer to my master's thesis itself in its text, e.g. in the sentence "These rules are sufficient to compute any differential in this ____".

I was wondering which of the following terms are appropriate to fill the gap: paper, thesis, text, work.
It's not a paper because this term usually denotes journal articles.

You can use the term thesis or the more generic work, instead.