ŠOJDR, L., ČERMÁK, J., BRIDA, G. Comparison of high-precision frequency-stability measurement systems. Piscataway: IEEE, 2003. ISSN 1075-6787. In: Proceedings of the 2003 IEEE International Frequency Control Symposium and PDA Exhibition Jountly with the 17th European Frequency and Time Forum. , s. 317-325.