Štefl, S., Baade, D., Rivinius, T., Kaufer, A., Stahl, O., Wolf, B. Intermittent periodic variations in the extended atmospheres of Be stars. In: BRADLEY, P.A., GUZIK, J.A., eds. A Half century of stellar pulsation interpretations: a Tribute Arthur N. Cox. San Francisco: Astronomical Society of the Pacific, 1998, s. 348-352. Astronomical Society of the Pacific Conference Series., 135.