@article{ERAAMS_1998_04_a14,
     author = {Ivanov, Sergei},
     title = {On aspherical presentations of groups},
     journal = {Electronic research announcements of the American Mathematical Society},
     pages = {109--114},
     publisher = {mathdoc},
     volume = {04},
     year = {1998},
     doi = {10.1090/S1079-6762-98-00052-3},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S1079-6762-98-00052-3/}
}