@article{MS2_1966__19_165969,
     author = {W.W. Boone and H., Jr. Rogers},
     title = {On a {Problem} of {J.H.C.} {Whitehead} and a {Problem} of {Alonzo} {Church.}},
     journal = {Mathematica Scandinavica},
     pages = {185--192},
     publisher = {mathdoc},
     volume = {19},
     year = {1966},
     zbl = {0166.26503},
     url = {http://geodesic.mathdoc.fr/item/MS2_1966__19_165969/}
}