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Department of Mathematics, Eastern Illinois University,
Charleston, USA, Fall’97.
University of Alicante, Alicante, Spain, June, 1998.
Istituto Per Applicazioni Della Matematica, Napoli (Italy) for
the period June 28, 1998 to July 6, 1998. 1999.
University of Rome “LA SEPINZA”, Rome, Italy, Sept, 1999.
Information Technology Services, Eastern Illinois University,
Charleston, USA, 2000
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