@misc{Zagrebnov_Valentin_A._Approximations,
 author={Zagrebnov, Valentin A.},
 howpublished={online},
 publisher={Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej},
 language={eng},
 type={artykuł},
 title={Approximations of self-adjoint C0-semigroups in the operator-norm topology},
 keywords={self-adjoint C0-semigroups, approximations, operator-norm topology},
}