@article{2011,
  author = {Glaucio Paulino and Leonard Gray},
  title = {Galerkin residuals for adaptive symmetric-Galerkin boundary element methods},
  year = {1999},
  journal = {Journal of engineering mechanics},
  volume = {125},
  number = {5},
  pages = {575{\textendash}585},
  publisher = {American Society of Civil Engineers},
}