“…Many answers have been offered and there is a large literature on the topic, including, for example, Lass & Anderson (1975), Lass (1976), Foley (1977), Escure (1977), Lass (1984), Dressler (1985), Anderson & Ewen (1987), Bauer (1988), Harris (1990Harris ( , 1994, Kirchner (1998), Se Âge Âral & Scheer (1999, Lavoie (2001). Many answers have been offered and there is a large literature on the topic, including, for example, Lass & Anderson (1975), Lass (1976), Foley (1977), Escure (1977), Lass (1984), Dressler (1985), Anderson & Ewen (1987), Bauer (1988), Harris (1990Harris ( , 1994, Kirchner (1998), Se Âge Âral & Scheer (1999, Lavoie (2001).…”