D. Bosq, Linear Processes in Function Spaces, Springer-Verlag, New York, 2000.
E.G. Gladyshev, Periodically correlated random sequences, Dokl. Akad. Nauk SSSR 137 (1961) 385--388.
H. Haghbin, Z. Shishebor and A.R. Soltani, Hilbertian spatial periodically correlated first order autoregressive models, Adv. Data Anal. Classif. 18, no. 3, 303--319.
H.L. Hurd, An Investigation of Periodically Correlated stochastic processes, PhD Dissertation, Duke University, Durham, North Carolina, 1969.
A.G. Miamee and H. Salehi, On the prediction of periodically correlated stochastic processes, in: Multivariate Analalysis V, pp. 167--179, North-Holland, Amsterdam-New York, 1980.
A. Parvardeh, N. Mohammadi Jouzdani, S. Mahmoodi and A.R. Soltani, First order autoregressive periodically correlated model in Banach spaces: existence and central limit theorem, J. Math. Anal. Appl. 449 (2017), no. 1, 756--768.
A.R. Soltani and M. Hashemi, Periodically correlated autoregressive Hilbertian processes, Stat. Inference Stoch. Process. 14 (2011) 177--188.
A.R. Soltani and Z. Shishebor, On infinite dimensional discrete time periodically correlated processes, Rocky Mountain J. Math. 37 (2007), no. 3, 1043--1058.