1. Adams, R. D., Denny-Brown, D., Pearson, C. M.: Diseases of Muscles: A Study in Pathology. New York: Hoeber 1953.
2. Barker, D.: The Structure and Distribution of Muscle Receptors. Symposium on Muscle Receptors, pp. 227?240. Hongkong: University Press 1962.
3. ?, The Motor Innervation of the Mammalian Muscle Spindle. Muscular Afferents and Motor Control, pp. 51?58. Ed. by Ragnar Granit. New York: Wiley and Sons 1966.
4. Boyd, I. A.: The motor innervation of mammalian muscle spindles. J. Physiol. (Lond.)159, 7?9P (1961).
5. ?: The structure and innervation of the nuclear bag muscle fibre system and the nuclear chain muscle fibre system in mammalian muscle spindles. Philosophical Transactions of the Royal Society, Series B,245, 81?136 (1962).