Separation of variables in the problems of normal and compact solvability of the exterior derivation operator.
On reflective subcategories of quasiabelian categories.
The Ker-Coker-sequence and its generalization in some classes of additive categories.
An addition theorem for the manifolds with the Laplacian having discrete spectrum.
On compact solvability of differentials of an elliptic differential complex.
On the cohomology sequence in a semiabelian category.
On the operator of exterior derivation on the Riemannian manifolds with cylindrical ends.
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