G. Bastin and D. Dochain, On-line estimation and adaptive control of bioreactors, Analytica Chimica Acta, vol.243, 1990.
DOI : 10.1016/S0003-2670(00)82585-4

R. S. Bucy and P. D. Joseph, Filtering for Stochastic Processes with Applications to Guidance, 1968.

S. Diop and I. Simeonov, A differential algebraic approach to anaerobic digestion estimation problems, 2006 14th Mediterranean Conference on Control and Automation, 2006.
DOI : 10.1109/MED.2006.328717

D. Dochain, . A. &p, and . Vanrolleghem, Dynamical modeling and estimation in wastewater treatment processes, 2001.

F. Ch, .. F. , and D. A. John-wase, Environmental biotechnology, 1990.

H. V. Galava, B. K. Angelidaki, and . Ahring, Kinetics and modeling of anaerobic digestion process, Adv. Biochem. Eng. Biotechnol, vol.81, pp.57-93, 2003.

A. Johansson and A. Medvedev, An observer for systems with nonlinear output map, Automatica, vol.39, issue.5, pp.909-918, 2003.
DOI : 10.1016/S0005-1098(03)00031-1

B. Kalchev, I. Simeonov, and N. Christov, Comparative study of three software sensors based on a simple anaerobic digestion model, Proc. of the Int. Conf. " Automatics and Informatics'08, pp.5-8, 2008.

B. Kuo, Automatic control systems, 1987.

P. Petkov, N. Christov, and M. Konstantinov, Analysis and synthesis of linear multivariable systems, Technika, 1983.

S. Popova, State observer for anaerobic fermentation process Automatics and Informatics'08, Proc. of the Int. Conf, pp.9-11, 2008.

I. Simeonov, Mathematical modeling and parameters estimation of anaerobic fermentation processes, Bioprocess Engineering, vol.21, issue.4, pp.377-381, 1999.
DOI : 10.1007/s004490050690

A. Solodov, System theory methods in the problem of continuous linear filtration, 1976.