@misc{indiciaeae2bd14ca3d2,
  title = {General variational principles applicable to the hybrid element method.},
  author = {I Herrera},
  year = {1977},
  doi = {10.1073/pnas.74.7.2595},
  url = {https://pubmed.ncbi.nlm.nih.gov/16592405/},
  note = {Source identifier: 16592405}
}