General analytic theory of classical collinear three-wave mixing in a monolithic cavity
M. Santandrea, M. Stefszky, C. Silberhorn, Journal of Optics (2021).

High-power waveguide resonator second harmonic device with external conversion efficiency up to 75%
M. Stefszky, R. Ricken, C. Eigner, V. Quiring, H. Herrmann, C. Silberhorn, Journal of Optics (2018).

Orbital angular momentum modes of high-gain parametric down-conversion
L. Beltran, G. Frascella, A.M. Perez, R. Fickler, P. Sharapova, M. Manceau, O.V. Tikhonova, R.W. Boyd, G. Leuchs, M.V. Chekhova, Journal of Optics 19 (2017).