Fourier series, quadrature formulae, interpolation of function spaces, stochastic processes.
Main publications:
Nursultanov E. D., Tleukhanova N. T., “Quadrature formulae for classes of functions of law smoothness”, Mat. Sb., 194:10 (2003), 133–160; translation in Sb. Math., 194:10 (2003), 1559–1584
Nursultanov E. D., “Interpolation theorems for anisotropic function spaces and their applications”, Dokl. Akad. Nauk RAN, 394:1 (2004), 22–25
Nursultanov E. D., Tleukhanova N. T., “Lower and upper bounds for the norm of multipliers of multiple trigonometric Fourier series in Lebesgue spaces”, Funktsional. Anal. i Prilozhen., 34:2 (2000), 86–88; translation in Funct. Anal. Appl., 34:2
\pges 151–153 (2000)
Nursultanov E. D., “On the coefficients of multiple Fourier series from $L^p$-spaces”, Izv. Ross. Akad. Nauk Ser. Mat., 64:1 (2000), 95–122; translation in Izv. Math., 64:1 (2000), 93–120
Nursultanov E. D., “Network spaces and inequalities of Hardy–Littlewood type”, Mat. Sb., 189:3 (1998), 83–102; translation in Sb. Math., 189:3–4 (1998), 399–419
; translation in Sb. Math., 194:10 (2003), 
