@article{10_4153_S0008439519000043,
     author = {Raghavan, Dilip and Verner, Jonathan L.},
     title = {Chains of {P-points}},
     journal = {Canadian mathematical bulletin},
     pages = {856--868},
     year = {2019},
     volume = {62},
     number = {4},
     doi = {10.4153/S0008439519000043},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439519000043/}
}