1. Nonstationary Structures and Diffusion Chaos;Akhromeeva,1992
2. On an equation of mixed type from electron scattering;Beals;J. Math. Anal. Appl.,1977
3. Partial-range completeness and existence of solutions to two-way diffusion equation;Beals;J. Math. Phys.,1983
4. On the parabolic equation sgnx |x|puy - uxx = 0 and a related one;Pagani;Annali di Matematica Pura ed Applicata,1974
5. Nonclassical Differential-Operator Equations;Egorov,2000