@article{10_4064_fm191_3_2,
     author = {Ludomir Newelski and Marcin Petrykowski},
     title = {Weak generic types and coverings of groups {I}},
     journal = {Fundamenta Mathematicae},
     pages = {201--225},
     publisher = {mathdoc},
     volume = {191},
     number = {3},
     year = {2006},
     doi = {10.4064/fm191-3-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm191-3-2/}
}