@inproceedings{saharon2000two,
title={Two cardinal invariants of the continuum (∂<α) and FS linearly ordered iterated forcing},
author={Saharon Shelah},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203344602200650},
booktitle={Acta Mathematica},
volume={192},
number={2},
pages={187-223},
year={2000},
}
Saharon Shelah. Two cardinal invariants of the continuum (∂<α) and FS linearly ordered iterated forcing. 2000. Vol. 192. In Acta Mathematica. pp.187-223. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203344602200650.