[1][Booch, 1991]
²This table is found on page 76 of [Jacobson, 1992].
³[Lorenz, 1993]
[4][Jones, 1984]
[5]Dan McNicholl in [Booch, 1987]
[6]Christine Youngblut in [Berard, 1993]
⁷[Lorenz, 1993]