Asma Barbata Michel Zasadzinski Harouna Souley Ali Hassani Messaoud ℌ∞ control for singular stochastic systems. 105-110 2013 ECC https://doi.org/10.23919/ECC.2013.6669838 conf/eucc/2013 db/conf/eucc/eucc2013.html#BarbataZAM13