@article{Cammaroto2026Math,
  author  = {Filippo Cammaroto},
  title   = {Constancy of Functions via a Complement to Ekeland Variational Principle},
  journal = {Mathematics},
  volume  = {14},
  number  = {13},
  pages   = {2346},
  year    = {2026},
  doi     = {10.3390/math14132346}
}