TÖRÖK, G., GOLUCHOVÁ, K., ŠRÁMKOVÁ, J., HORÁK, J., BAKALA, P., URBANEC, M. A one-parametric formula relating the frequencies of twin-peak quasi-periodic oscillations. In: Proceedings of RAGtime 17/19: Workshops on black holes and neutron stars. Opava: Silesian University, 2017, s. 177-193. Publications of the Institute of Physics. ISBN 9788075102577. ISSN 2336-5668. Available: http://proceedings.physics.cz/images/proc17/tor.pdf