$$
\newcommand{\uex}{{u_{\small\mbox{e}}}}
\newcommand{\Aex}{{A_{\small\mbox{e}}}}
\newcommand{\half}{\frac{1}{2}}
\newcommand{\tp}{\thinspace .}
\newcommand{\dfc}{\alpha} % diffusion coefficient
\newcommand{\dx}{\, \mathrm{d}x}
\newcommand{\ds}{\, \mathrm{d}s}
$$
Bibliography
- R. Rannacher.
Finite element solution of diffusion problems with irregular data,
Numerische Mathematik,
43,
pp. 309-327,
1984.