On embedding certain partial orders into the P-points under Rudin-Keisler and Tukey reducibility. Raghavan, D. & Shelah, S. Transactions of the American Mathematical Society, 369:4433–4455, 2017.
bibtex   
@article{RaSh:1058,
author = {Raghavan, Dilip and Shelah, Saharon},
trueauthor = {Raghavan, Dilip and Shelah, Saharon},
fromwhere = {3,IL},
journal = {Transactions of the American Mathematical Society},
pages = {4433--4455},
title = {{On embedding certain partial orders into the P-points
 under	Rudin-Keisler and Tukey reducibility}},
volume = {369},
year = {2017},
}

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