¹[Shlaer, 1988], page 15
²[Booch, 1991]
³[Jacobson, 1992]
⁴[Abbott,1983]
⁵Scenarios play a role in other methodologies. See for example [Jacobson, 1992], [Lorenz, 1993] and [Rumbaugh, 1991]. Jacobson and Lorenz use the term "use case" instead of "scenarios".
⁶[Rumbaugh, 1991] discusses in great detail the problem of modeling these types of relations between objects and classes. Also see [de Champeaux, 1993].