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First Author:
 
Marian Gidea
Northeastern Illinois University
mgidea@neiu.edu
 
Department of Mathematics, 5500 N St Louis Ave
Chicago, 60625, USA
 
773-442-5779(Phone)
773-442-5779(Fax)
http://www.neiu.edu/~mgidea

Second Author:

David Quaid
Northeastern Illinois University
bitey7274@yahoo.com
 
Department of Mathematics, 5500 N St Louis Ave
Chicago, 60625, USA