@misc{indiciae7458ea8d9818,
  title = {Gradionation: hypothesis for positioning and patterning.},
  author = {L E Roth and D J Pihlaja},
  year = {1977},
  doi = {10.1111/j.1550-7408.1977.tb05273.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/864624/},
  note = {Source identifier: 864624}
}