ON THE RIESZ BASIS PROPERTY OF ROOT VECTORS SYSTEM FOR 2 × 2 DIRAC TYPE OPERATORS Article Lunyov Anton A., Malamud Mark M. Journal of Mathematical Analysis and Applications. Academic Press Inc.. Vol. 441. 2016. P. 57-103
SCHOENBERG MATRICES OF RADIAL POSITIVE DEFINITE FUNCTIONS AND RIESZ SEQUENCES OF TRANSLATES IN $$L^2({\MATHBB R}^N)$$ L 2 ( R N ) Article Golinskii L., Malamud M., Oridoroga L. JOURNAL OF FOURIER ANALYSIS AND APPLICATIONS. Birkhäuser Boston Inc.. Vol. 21. 2015. P. 915-960