by Hanson, James W., Sayers, Martin P., Knopp, Lawrence M., Macdonald, Constance, Smith, David W.
Published in The Journal of pediatrics (01.08.1977)

by KNOPP, L M, HARKINS, H N
Published in Surgery (01.03.1954)

by ATKINSON, J R, KNOPP, L M, WARD, Jr, A A
Published in Neurology (01.02.1957)

by FOLTZ, E L, KNOPP, L M, WARD, Jr, A A
Published in Journal of neurosurgery (01.01.1959)

by WARD, Jr, A A, FOLTZ, E L, KNOPP, L M
Published in Journal of neurosurgery (01.05.1956)

by FOLTZ, E L, KNOPP, L M, WARD, Jr, A A
Published in Journal of neurosurgery (01.09.1956)