On the robust stability and robust control via reflections coefficients [Electronic resource]Nurges, Ülo; Rüstern, EnnuProceedings of the First African Control Conference : University of Cape Town, Cape Town, South Africa, 3-5 December 20032003 / p. 381-386 [CD-ROM]

Robust pole placement by quadratic programmingNurges, Ülo; Rüstern, Ennu5th IFAC Symposium on Robust Control Design : Toulouse, France, July 4-7, 20062006 / p. 333-338 https://www.sciencedirect.com/science/article/pii/S1474667015335217

Stability margin via reflection vectors [Electronic resource]Nurges, ÜloProceedings of European Control Conference : Cambridge, UK, 20032003 / [4] p. : ill. [CD-ROM]