@Article{snyder2000,
author="Snyder, Noah",
title="An Alternate Proof of {M}ason's Theorem",
journal="Elemente der Mathematik",
year="2000",
month="Aug",
day="01",
volume="55",
number="3",
pages="93--94",
issn="1420-8962",
doi="10.1007/s000170050074",
url="https://doi.org/10.1007/s000170050074"
}

@misc{lemmermeyer05,
  author="Franz Lemmermeyer",
  title="Algebraic {G}eometry (lecture notes)",
  year=2005,
  howpublished="\url{http://www.fen.bilkent.edu.tr/~franz/ag05/ag-02.pdf}"
}
