@inproceedings{p.1953estimation,
title={Estimation and information in stationary time series},
author={P. Whittle},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203416973181893},
booktitle={Arkiv for Matematik},
volume={2},
number={5},
pages={423-434},
year={1953},
}