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First Author:
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| Marian Gidea |
| Northeastern Illinois University |
| mgidea@neiu.edu |
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| Department of Mathematics, 5500 N St Louis Ave |
| Chicago, 60625, USA |
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| 773-442-5779(Phone) |
| 773-442-5779(Fax) |
| http://www.neiu.edu/~mgidea |
Second Author:
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| David Quaid |
| Northeastern Illinois University |
| bitey7274@yahoo.com |
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| Department of Mathematics, 5500 N St Louis Ave |
| Chicago, 60625, USA |
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