@article{ZastrowHackl2008,
  author    = {Udo Zastrow and Klaus Hackl},
  title     = {On the existence, uniqueness and completeness of displacements and stress functions in linear elasticity / Hackl, Klaus ; Zastrow, Udo},
  journal   = {Journal of Elasticity. 19 (1988), H. 1},
  pages     = {3 -- 23},
  year      = {2008},
}