1. Generalized functions;Gelfand,1967
2. Generalized functions;Gelfand,1968
3. General Lattice Theory;Grätzer,1978
4. L. Hörmander, The Analysis of Linear Partial Differential Operators, vol. I, Springer, Berlin, Heidelberg, New York, Tokyo, 1983.
5. On the theory of Fourier hyperfunctions and its applications to partial differential equations with constant coefficients;Kawai;J. Fac. Sci. Univ. Tokyo (Sec. 1A Math.),1970