[8] Thomas, 1888, p, 325.
[9] Förstemann, 1898.
[10] Ibid., 1901, pp. 118-133.
[11] Förstemann, 1901, p. 121.
[12] Ibid., p. 123.
[13] Bowditch, 1910, pp. 211-231.
[14] Ibid., p. 218.
[15] Bowditch, 1910, pp. 222, 223.
[16] Ibid., p. 224.
[17] Ibid., pp. 229, 230.