@article{GT_2015_19_1_a9,
     author = {Levine, Adam and Ruberman, Daniel and Strle, Sa\v{s}o},
     title = {Nonorientable surfaces in homology cobordisms},
     journal = {Geometry & topology},
     pages = {439--494},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {2015},
     doi = {10.2140/gt.2015.19.439},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2015.19.439/}
}