On Recursive Calculation of M- and GM-Estimates by Direct Identification in LQG Control Systems. - Nasko Atanasov (Informatica, 2009)

Closed-Loop System Identification with Modifications of the Instrumental Variable Method. - Nasko Atanasov; Alexandar Ichtev (Informatica, 2010)

Closed-Loop System Identification with Recursive Modifications of the Instrumental Variable Method. - Nasko Atanasov; Alexandar Ichtev (Informatica, 2011)