Plumley 1975a, p. 104; Browne 1989c, p. 70; Browne 1992b, p. 33; Browne 1992c, p. 381; Browne 1994b, pp. 35–40, 47–48; Browne 1995a, pp. 457–458; Browne 1998c, pp. 16–17; Browne 2000a, pp. 33–34; Browne 2000b, pp. 161–162; Brakmann 2006, p. 295; Ochała 2013, passim, esp. pp. 190–192; Łajtar 2014a, p. 392; Ochała 2015, passim, esp. pp. 7–9; Łajtar 2015–2016, p. 135 (no. 104); Łajtar 2020b, Appendix no. QI54 (cf. p. 187)