1. R. S. Anderssen, A Review of Numerical Methods for Certain Improperly Posed Parabolic Partial Differential Equations, Technical Report No. 36, Computer Centre, Australian National University, August 1970.
2. On direct methods for solving Poisson’s equations;Buzbee, B. L.;SIAM J. Numer. Anal.,1970
3. Some numerical results for the solution of the heat equation backwards in time;Cannon, J. R.,1966
4. The approximation of harmonic and parabolic functions on half-spaces from interior data;Cannon, J. R.,1968
5. The abstract backward beam equation;Carasso, Alfred;SIAM J. Math. Anal.,1971