By Green William R.   in The College Mathematics Journal

ISSN:1931-1346|42|5|399-402

Mathematical Association of America‎(2011)‎

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By Erdoğan M. Burak   Goldberg Michael   Green William R.   in Communications in Partial Differential Equations

ISSN:0360-5302|39|10|1936-1964

Taylor & Francis Ltd‎(2014)‎

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