@article{schur1911,
  author = {Schur, Issai},
  title = {{Bemerkungen zur Theorie der beschr{\"a}nkten Bilinearformen mit unendlich vielen Ver{\"a}nderlichen}},
  journal = {Journal f{\"u}r die reine und angewandte Mathematik},
  volume = {140},
  pages = {1--28},
  year = {1911},
  doi = {10.1515/crll.1911.140.1},
  url = {https://gdz.sub.uni-goettingen.de/id/PPN243919689_0140}
}

@article{aronszajn1950,
  author = {Aronszajn, Nachman},
  title = {Theory of reproducing kernels},
  journal = {Transactions of the American Mathematical Society},
  volume = {68},
  number = {3},
  pages = {337--404},
  year = {1950},
  doi = {10.1090/S0002-9947-1950-0051437-7},
  url = {https://www.ams.org/journals/tran/1950-068-03/S0002-9947-1950-0051437-7/}
}