Adams - Alexander - Allen 1983, p. 54; Adams 1996, p. 243 (translation); Bechhaus-Gerst 2000, pp. 23–5 (for 'soulou'); Ruffini 2012a, pp. 207–12 (no. B); Ruffini 2014a, n. 4 on p. 961; Ruffini 2014b, pp. 226, 227; Weschenfelder 2015, pp. 287–8, 296–9