By Joseph Dan   Hartman Gregory   Gibson Caleb   in The College Mathematics Journal

ISSN:1931-1346|42|4|275-282

Mathematical Association of America‎(2011)‎

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By Hartman Gregory M.D.   Clague John J.   in Canadian Journal of Earth Sciences

ISSN:1480-3313|45|5|549-564

NRC Research Press‎(2008)‎

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