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• Current address : Selcuk University Faculty of Science and Arts Department of Mathematics Campus 42075 Konya Turkey, 2949-1 Shiokita-cho, Hinagu, Yatsushiro-shi, Kumamoto-ken 869- , JAPAN
• E-mail address : ayseuresin@mynet.com, akeskin@selcuk.edu.tr, *t.noiri@nifty.com URL: http://math.science.ankara.edu.tr