Siegfried Selberherr Christian A. Ringhofer Implications of Analytical Investigations About the Semiconductor Equations on Device Modeling Programs. 52-64 1984 3 IEEE Trans. on CAD of Integrated Circuits and Systems 1 http://ieeexplore.ieee.org/xpls/abs_all.jsp?isnumber=28427&arnumber=1270057&count=14&index=7 db/journals/tcad/tcad3.html#SelberherR84