Analytical and numerical studies for slip  flows of a generalised Phan-Thien-Tanner  fluid
          Ângela Ribau; L. L. Ferrás; Morgado, M. Luísa; Magda rebelo; A. M. Afonso  
          
          Z Angew Math Mech.,  (2020), e201900183  
          https://onlinelibrary.wiley.com/doi/10.1002/zamm.201900183  
           
            
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