Liang, Zhao-Zheng; Zhang, Guo-Feng Robust preconditioning techniques for multiharmonic finite element method with application to time-periodic parabolic optimal control problems. (English) Zbl 07400549 Adv. Comput. Math. 47, No. 5, Paper No. 67, 38 p. (2021). MSC: 65F10 65F50 65F15 65N22 65N30 49K20 × Cite Format Result Cite Review PDF Full Text: DOI
Liang, Zhao-Zheng; Axelsson, Owe; Zhang, Guo-Feng Efficient iterative solvers for a complex valued two-by-two block linear system with application to parabolic optimal control problems. (English) Zbl 1433.65047 Appl. Numer. Math. 152, 422-445 (2020). MSC: 65F10 65F08 65K10 × Cite Format Result Cite Review PDF Full Text: DOI