@incollection {key823287m,
AUTHOR = {Scharlemann, Martin},
TITLE = {3-manifolds with \$H_2(A,\partial A)=0\$
and a conjecture of {S}tallings},
BOOKTITLE = {Knot theory and manifolds},
EDITOR = {Rolfsen, D.},
SERIES = {Lecture Notes in Mathematics},
NUMBER = {1144},
PUBLISHER = {Springer},
ADDRESS = {Berlin},
YEAR = {1985},
PAGES = {138--145},
DOI = {10.1007/BFb0075017},
NOTE = {(Vancouver, BC, 2--4 June 1983). MR:823287.
Zbl:0585.57011.},
ISSN = {0075-8434},
ISBN = {9783540396161},
}