@article{alpay2019positivity,
  title = {Positivity, rational {S}chur functions, {B}laschke factors, and other related results in the {G}rassmann algebra},
  author = {Alpay, Daniel and Paiva, Ismael L. and Struppa, Daniele C.},
  fjournal = {Integral Equations and Operator Theory},
  journal = {Integral Equ. Oper. Theory},
  volume = {91},
  issue = {2},
  pages = {8},
  numpages = {39},
  year = {2019},
  month = {Feb},
  doi = {10.1007/s00020-019-2506-6},
  publisher = {Springer Science and Business Media {LLC}},
  archiveprefix = {arXiv},
  primaryclass = {math.FA},
  arxivid = {1810.02843},
  eprint = {1810.02843}
}