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2. Investigation of non-linear problems of the theory of filtering;Karchevskii,1974
3. On the solution of some non-linear problems in filtering theory;Lyashko;Izv. VUZov. Matematika,1975
4. Les inequations en mecanique et en physique;Duvaut,1972
5. Existence theorems in elasticity theory;Fikera,1974