E. A. Tsygankov, D. S. Chuchelov, M. I. Vaskovskaya, V. V. Vassiliev, S. A. Zibrov, V. L. Velichansky. "Frequency locking: A distinctive feature of the coherent population trapping." Journal of Applied Physics (2025). https://doi.org/10.1063/5.0252868