@article{2021-symfem,
       AUTHOR = {Scroggs, Matthew W.},
        TITLE = {Symfem: a symbolic finite element definition library},
         YEAR = {2021},
      JOURNAL = {Journal of Open Source Software},
       VOLUME = {6},
       NUMBER = {64},
        PAGES = {{3556}},
          DOI = {10.21105/joss.03556},
}