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• Multani Mal Modi College, Patiala, India.
• E-mail address: varun82jain@gmail.com
• University College of Engineering, Punjabi University, Patiala, India.
• E-mail address: dr rk37c@yahoo.co.in
• Department of Mathematics, Punjabi University, Patiala, India.
• E-mail address: rakeshnagaich@yahoo.com