@article{GrajewskiHronTurek2020,
  author    = {Matthias Grajewski and Jaroslav Hron and Stefan Turek},
  title     = {Dual weighted a posteriori error estimation for a new nonconforming linear finite element on quadrilaterals},
  journal   = {Applied Numerical Mathematics},
  volume    = {54},
  number    = {3-4},
  pages     = {504 -- 518},
  doi       = {10.1016/j.apnum.2004.09.016},
  year      = {2020},
}