Gragnani, A. <https://pure.iiasa.ac.at/view/iiasa/1294.html>, Rinaldi, S. <https://pure.iiasa.ac.at/view/iiasa/253.html>, & Feichtinger, G. <https://pure.iiasa.ac.at/view/iiasa/2589.html>  (1995).  Slow-Fast limit cycles in controlled drug markets.   In: Proceedings of 3rd European Control Conference ECC '95, 5-8 September 1995.