Danilin, A. R.; Zorin, A. P. Asymptotic expansion of solutions to optimal boundary control problems. (English. Russian original) Zbl 1229.49030 Dokl. Math. 84, No. 2, 665—668 (2011); translation from Dokl. Akad. Nauk 440, No. 4, 449—452 (2011). MSC: 49M30