1. Alibert, J.-J., Raymond, J.-P.: Boundary control of semilinear elliptic equations with discontinuous leading coefficients and unbounded controls. Numer. Funct. Anal. Optim. 18, 235–250 (1997)
2. Amann, H.: Dynamic theory of quasilinear parabolic equations: Abstract evolution equations. Nonlinear Anal. Theory Methods Appl. 12, 895–919 (1988)
3. Teubner-Texte zur Mathematik;H. Amann,1993
4. Auscher, P., Tchamitchian, P.: Square root problem for divergence operators and related topics, Astérisque, 249 (1998)
5. Bandelow, U., Kaiser, H.-C., Koprucki, T., Rehberg, J.: Modeling and simulation of strained quantum wells in semiconductor lasers. In: Jäger, W., Krebs, H.-J. (eds.) Mathematics—Key Technology for the Future. Joint Projects Between Universities and Industry, pp. 377–390. Springer, Berlin/Heidelberg (2003)