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2. Allen, E. R., Pepe, F. A.: Ultrastructure of developing muscle cells in the chick embryo. Amer. J. Anat. 116, 115?148 (1965).
3. Andersson-Cedergren, E., Muscatello, V.: The participation of the sarcotubular system in glycogen metabolism. J. Ultrastruct. Res. 8, 391?401 (1963).
4. Barker, D.: The innervation of mammalian skeletal muscle. In: de Reuck, A. V. S., and J. Knight (eds.) Myotatic, kinesthetic, and vestibular mechanisms. Ciba Foundation Symposium, pp. 3?19. London: J. & A. Churchill 1967.
5. ?, Cope, M.: The innervation of individual intrafusal muscle fibres. In: Barker D. (ed.) Symposium on muscle receptors, pp. 263?269. Hong Kong: Hong Kong University Press 1962.