@article{etna_vol54_pp460-482,
  author  = {Harri Hakula and Semen Nasyrov and Matti Vuorinen},
  title   = {Conformal moduli of symmetric circular quadrilaterals with cusps},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {54},
  year    = {2021},
  pages   = {460--482},
  doi     = {10.1553/etna_vol54s460},
}