Modelling of cycling of lithium battery with microporous carbon electrode von Portnyagin, D.

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Boundedness of weak solutions of a nondiagonal singular parabolic system of three equations von Portnyagin, D.V.

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On the Dirichlet problem for a quasilinear elliptic second order equation with triple degeneracy and singularity in a domain with edge on the boundary von Borsuk, M., Portnyagin, D.

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