Vol. 30 No. 2 (2020)

Research Articles

• Duality for a class of second order symmetric nondifferentiable fractional variational problems

  Ashish Kumar Prasad, Anant Pratap Singh, Sony Khatri

  121-136

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• Portfolio selection using R

  Rohan Mishra, Bhagwat Ram

  137-146

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• Modelling cooperative advertising decisions in a manufacturer-distributor-retailer supply chain using game theory

  Peter E. Ezimadu

  147-176

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• Estimation of parameters of Nadarajah-Haghighi extension of the exponential distribution using perfect and imperfect ranked set sample

  Marija Minić

  177-198

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• On power of control chart for the ratio of two Poisson distributions under misclassification error

  Ashit B. Chakraborty, Anwer Khurshid

  199-208

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• Joint optimal decisions on pricing and warranty policy of duopoly supply chain with one common retailer

  Soumita Kundu, Tripti Chakrabarti

  209-236

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• Optimizing preservation strategies for deteriorating items with time-varying holding cost and stock-dependent demand

  Aditi Khanna, Priyamvada, Chandra K. Jaggi

  237-250

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