@misc{Gubareni_Nadiya_Some,
 author={Gubareni Nadiya},
 howpublished={online},
 publisher={Wydaw. Politechniki Częstochowskiej},
 language={eng},
 title={Some mixed matrix problems over several discrete valuation rings},
 type={czasopismo},
 keywords={valuation rings, local invariant rings, discrete valuation rings, approximation theorem, mixed flat matrix problems},
}