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[1] W.A. Bogley, J.H.C. Whitehead's asphericity question, in Twodimensional Homotopy and Combinatorial Group Theory, eds. C. HogAngeloni, W. Metzler and A.J. Sieradski, LMS Lecture Note Series 197, CUP (1993).
[2] J. Harlander, S. Rosebrock, Generalized knot complements and some aspherical ribbon disc complements, Journal of Knot Theory and Its Rami cations, Volume 12, no. 7, (2003), pp 947{962.
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[6] G. Huck and S. Rosebrock, Aspherical labeled oriented trees and knots, Proc. of the Edinburgh Math. Society 44, (2001), pp. 285{294.
[7] S. Rosebrock, The Whitehead Conjecture  an overview, Siberian Electronic Mathematical Reports 4 (2007), pp. 440{449.
[8] J. Stallings, A graphtheoretic lemma and groupembeddings, in Proceedings of the Alta Lodge 1984, (ed. Gersten and Stallings), Annals of Mathematical Studies, Princeton University Press (1987) pp. 145{155.