Compare and contrast (similarities or differences or both) three (or more) research articles. What are the issues the authors have addressed in these articles and what they have found or argued?

Article 2 - This paper provides a decision framework to support SSS & OA for multiple periods in a multi-supplier, multi-item situation where, There are uncertainties in the availability of the suppliers in each period, Each supplier has its own pricing policy including discounts, Lost sales are allowed, The demand in each period is stochastic, One supplier can produce/deliver more than 1 item.

Article 3 - three issues are examined, including: (i) Which approaches were prevalently applied? (ii) Which evaluating criteria were paid more attention to? (iii) Is there any inadequacy of the approaches?