Yost, D. C., Matveev, A. N., Grinin, A., Peters, E., Maisenbacher, L., Beyer, A., Pohl, R., Kolachevsky, N. N., Khabarova, K., Hänsch, T. W., & Udem, T. (2016). Spectroscopy of the hydrogen 1S-3S transition with chirped laser pulses. Physical Review A, 93(4):. doi:10.1103/PhysRevA.93.042509.