@inproceedings{e.1984a,
title={A lower bound for projection operators on$L$^{1}(−1, 1)},
author={E. Görlich, and C. Markett},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203521390230441},
booktitle={Arkiv for Matematik},
volume={24},
number={1},
pages={81-92},
year={1984},
}
E. Görlich, and C. Markett. A lower bound for projection operators on$L$^{1}(−1, 1). 1984. Vol. 24. In Arkiv for Matematik. pp.81-92. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203521390230441.