@book{ash-lee-20-fmc,
  author = {Ashlock, Daniel and Lee, Colin},
  title = {An Introduction to Proofs with Set Theory},
  publisher = {Morgan {\&} Claypool},
  doi = {10.2200/S01018ED1V01Y202006MAS035},
  year = 2020,
  month = jun,
  pages = {249},
  comment = {Table of contents is very much like our book \emph{Fundamentos ...}.  Could he have copied it?},
  abstract = {This text is intended as an introduction to mathematical proofs for students. It is distilled from the lecture notes for a course focused on set theory subject matter as a means of teaching proofs. [...]}
}