Лев Капитанский, “Универсальный оператор продолжения”, Функц. анализ и его прил., 59:3 (2025), 64–70; Lev Kapitanski, “Universal extension operator”, Funct. Anal. Appl., 59:3 (2025), 271–276
K. A. Bekmaganbetov, K. Ye. Kervenev, E. D. Nursultanov, “Nikol’skii–Besov spaces with a dominant mixed derivative and with a mixed metric: interpolation properties, embedding theorems, trace and extension theorems”, Eurasian Math. J., 16:2 (2025), 30–41
W. Sickel, “Smoothness spaces related to Morrey spaces – a survey. I”, Eurasian Math. J., 3:3 (2012), 110–149
Scharf B., Schmeisser H.-J., Sickel W., “Traces of Vector-Valued Sobolev Spaces”, Math. Nachr., 285:8-9 (2012), 1082–1106
Berkolaiko M.Z., “Traces of Generalized Spaces of Differentiable Functions with Mixed Norms”, Doklady Akademii Nauk Sssr, 277:2 (1984), 270–274
; Lev Kapitanski, “Universal extension operator”, Funct. Anal. Appl., 59:3 (2025), 
