Document Type : Research Paper
Authors
1 Department of Mathematics, School of Science, University of Phayao, Mae Ka, Mueang, Phayao 56000, Thailand
2 Department of Mathematics, Rajah Serfoji Government College (affiliated to Bharathidasan University), Thanjavur-613005, Tamilnadu, India
3 Department of mathematics, Rajah Serfoji Government College, Thanjavur, Tamilnadu, India
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