Help: Increased Lagrange algorithm with projection

Hi. Could someone out there tell me what "Increased Lagrange algorithm with

projection" is, in the context of computational plasticity? It could be the

alternative on the Newton method. In the integration of the constitutive

equation, algorithm looks like this:

\begin{equation}

\dot{\sigma}=D_{ep} \dot{\epsilon}

\end{equation}

where $\dot{\epsilon}$ is NOT total strain increment, but rather

\begin{equation}

\dot{\epsilon}={1 \over 2}(\dot e + D^{-1} \dot s)

\end{equation}

and $\dot e$ is the total strain increment and $\dot s$ is the corresponding

predictor stress.

Any information is welcome.

Thanks in advance.

Weiping Hu