Bodine M., J.-D. Deschênes, I. Khader, W. Swann, H. Leopardi, K. Beloy, T. Bothwell, S. Brewer, S. Bromley, J.-S. Chen, and S.A. Diddams, Physical Review Research 2, 033395 (2020).
Yao J., T.E. Parker, N. Ashby, and J. Levine, Ieee Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 65, 127-134 (2018).