@entry{ash-lee-20-aa,
  author = {D Ashlock and C Lee},
  title = {An Introduction to Proofs with Set Theory},
  journal = {Synthesis Lectures on Mathematics and ...,},
  year = 2020,
  url = {{\url{https://www.morganclaypool.com/doi/abs/10.2200/S01018ED1V01Y202006MAS035}}},
  quotes = {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 ...}
}