1. Jednotková parabola, zlatý řez a parabolické;Spíchal L.;Rozhledy Matematicko-fyzikální,2021
2. About the harmonic mean of the unit parabola
3. A new form of the Machin-like formula for π by iteration with increasing integers;Abrarov SM;J Integer Seq,2022
4. Navarro J. Secrets of π. Why the circle can’t be squared. RBA ColeccionabLes SA; 2017.
5. Machin’s formula and Pi;Nishiyama Y.;Int J Pure Appl Math,2013