A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, L. Fajt, F. Šimkovic, I. Štekl et al.: The inter-cluster time synchronization systems within the Baikal-GVD detector. In: 36th International Cosmic Ray Conference. Trieste: Proceedings of Science, 2019, pp. 1-7.