@article{10_4064_fm_133_2_161_168,
     author = {Tim Carlson and Richard Laver},
     title = {Sacks reals and {Martin's} axiom},
     journal = {Fundamenta Mathematicae},
     pages = {161--168},
     publisher = {mathdoc},
     volume = {133},
     number = {2},
     year = {1989},
     doi = {10.4064/fm-133-2-161-168},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-133-2-161-168/}
}