1. Britton SW, Kline RF (1939) On deslothing the sloth. Science 90: 16–17.
2. Bullock TH (1953) Comparative aspects of some biological transducers. FedProc 12: 666–672.
3. Enger PS, Bullock TH (1965) Physiological basis of slothfulness in the sloth. Hvalradets Skrifter 48:143–160.
4. Katsuki Y, Yoshino S, Chen J (1951) Neural mechanism of the lateral-line organ of fish (Fundamental neural mechanismof sensory organs in general). Jap J Physiol 1: 264–268.
5. Katsuki Y, Chen J, Takeda H (1954) Fundamental neural mechanism of the sense organ. Bull Tokyo Med DentUniv 1: 21–31.