@article{914972,
      author = {Langtangen, Hans Petter, and Mardal, Kent-Andre.},
      url = {http://library.usi.edu/record/914972},
      title = {Introduction to numerical methods for variational problems  /},
      publisher = {Springer,},
      recid = {914972},
      pages = {1 online resource},
      address = {Cham :},
      year = {2019},
}