Extending the method of fundamental solutions to potential problems with discontinuous boundary conditions
          Valtchev, Svilen S. ; Alves, Carlos J. S.  
          
          Advances in Boundary Element & Meshless Techniques XVIII (Ed: L Marin, M H Aliabadi),  (2017), 132-137  
          https://www.researchgate.net/publication/318015095_Advances_in_Boundary_Element_and_Meshless_Techniques_XVIII  
           
            
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