@article{10_4064_fm_141_1_61_73,
     author = {Janet Heine Barnett},
     title = {Weak variants of {Martin's} {Axiom}},
     journal = {Fundamenta Mathematicae},
     pages = {61--73},
     publisher = {mathdoc},
     volume = {141},
     number = {1},
     year = {1992},
     doi = {10.4064/fm-141-1-61-73},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-141-1-61-73/}
}