@article{10_1017_S0017089500008430,
     author = {Bogley, William A.},
     title = {An embedding for \ensuremath{\pi}2 of a subcomplex of a finite contractible two-complex},
     journal = {Glasgow mathematical journal},
     pages = {365--371},
     year = {1991},
     volume = {33},
     number = {3},
     doi = {10.1017/S0017089500008430},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500008430/}
}