@article{10_4064_fm204_2_2,
     author = {Arthur W. Apter},
     title = {Indestructibility, strong compactness,
 and level by level equivalence},
     journal = {Fundamenta Mathematicae},
     pages = {113--126},
     publisher = {mathdoc},
     volume = {204},
     number = {2},
     year = {2009},
     doi = {10.4064/fm204-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm204-2-2/}
}