|  | 
 L.P. Castro 
Department of Mathematics 
University of Aveiro 
3810 - 193 Aveiro 
Portugal. 
Email: lcastro@mat.ua.pt 
  - Castro, L.P.,
 
    Strongly Elliptic Operators for a Plane Wave Diffraction Problem in Bessel Potential Spaces,
    Volume 3, Issue 2,
    Article 25, 2002. [002_01] 
 
  |  | 
 |