Robert Buche Buche, R., Ghosh, A. P., & Pipiras, V. (2012). HEAVY TRAFFIC APPROXIMATIONS OF A QUEUE WITH VARYING SERVICE RATES AND GENERAL ARRIVALS. STOCHASTIC MODELS, 28(1), 63–108. https://doi.org/10.1080/15326349.2012.646526 Buche, R., & Kushner, H. J. (2005). Adaptive optimization of least-squares tracking algorithms: With applications to adaptive antenna arrays for randomly time-varying mobile communications systems. IEEE TRANSACTIONS ON AUTOMATIC CONTROL, 50(11), 1749–1760. https://doi.org/10.1109/TAC.2005.858682 Buche, R., & Kushner, H. J. (2004). Control of mobile communication systems with time-varying channels via stability methods. IEEE TRANSACTIONS ON AUTOMATIC CONTROL, 49(11), 1954–1962. https://doi.org/10.1109/TAC.2004.837590