@article{2000-snyder ,note={URL: {\tt http://www.springerlink.com/openurl.asp?genre=article\&issn=0013-6018\&volume=55\&issue=3\&spage=93}} ,author={Noah Snyder} ,ISSN={0013--6018} ,journal={Elemente der Mathematik} ,MR={2001g:11033} ,pages={93--94} ,title={{An alternate proof of Mason's theorem}} ,volume={55} ,year={2000} }