https://katalog.hfmdd.de/Record/ai-49-aHR0cDovL2R4LmRvaS5vcmcvMTAuMTUxNS85NzgzMTEwNTcxNDkzLTAwMg Strzelecki, Paweł:
New Directions in Geometric and Applied Knot Theory: Geometric curvature energies: facts, trends, and open problems. 2017. — 8-35.