Hitchcock ER, Broggi G, Burzaco J, Martin-Rodriguez J, Meyerson BA, Tóth S (eds.): Advances in Stereotactic and Functional Neurosurgery 9. Acta Neurochirurgica Supplement, volume 52; Springer, Vienna; pp. 137-139; ISBN 978-3-7091-9162-0
1991,
Spinelli JJ, Band PR, Svirchev LM, Gallagher RP