@article {31542,
	title = {Inference for the Lagged Cross-Covariance Operator Between Functional Time Series},
	journal = {Journal of Time Series Analysis },
	volume = {40},
	year = {2019},
	pages = {665-692},
	url = {https://doi.org/10.1111/jtsa.12447},
	author = {G Rice and M Shum}
}
