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Click to increase image sizeClick to decrease image size Additional informationNotes on contributorsDragan JankovićDragan Janković: I received my Ph.D. from the University of Belgrade, Yugoslavia, in 1983. Since then I have spent one year at the University of Arkansas, Fayetteville, and three years at Texas Tech University, Lubbock. at present I have a year's study leave from my position at East Central University, Ada, Oklahoma.T. R. HamlettT. R. Hamlett: I received my B.A. ('71) from Arkansas College and my M.S. ('73) and Ph.D. ('75) from the University of Arkansas under the direction of Paul Long. After three years military duty at Wright-Patterson AFB, Ohio, I spent three years at Arkansas Tech University, one year at Arkansas College, and am concluding my eighth year at East Central University, Ada, Oklahoma.
Janković et al. (Sun,) studied this question.