Allan and Jenkins (1993), Brooke et al. (1982), Brown (1959), Cooper and Hockey (1981), Cooper et al. (1982), Courtenay-Latimer (1963), Cowan (1995), Cowan and Marneweck (1996), Day (1981), Frost and Johnson (1977), Grindley (1959), Manry (1978), Morant and O’Callaghan (1990), Noli-Peard and Williams (1991), Plowes (1943), Roberts (1989), Ryan and Bloomer (in press), Ryan and Cooper (1985), Ryan et al. (1998), Swart et al. (1988), van Zyl (1991), Whitelaw et al. (1978), Williams (1986).
