[1]
Burenkov, V. and Tuyen, B.T. 2019. On spectral stability problem for a pair of self-adjoint elliptic differential operators on bounded open sets. Eurasian Mathematical Journal. 10, 3 (Sep. 2019), 84–88. DOI:https://doi.org/10.32523/2077-9879-2019-10-3-84-88.