https://opg.optica.org/ol/fulltext.cfm?uri=ol-26-10-692&id=64255 (Publisher version)
Joly, N., & Bielawski, S. (2001). Suppression of Q-switch instabilities by feedback control in passively mode-locked lasers. Optics Letters, 26, 692-694. doi:10.1364/OL.26.000692.