blowflies    A DDE model of Gurney and Nisbet's (1981) model of 
             Nicholson's (1954) blowflies. (requires PBSmodelling)

cooling      An ODE of Newton's Law of Cooling.

lorenz       An ODE of the Lorenz equation.

icecream     A DDE with switches (SDDE) modelling Papa Schnutio's 
             Gelati Palace with periodic deliveries of delicious spumoni
             and random thievery by Raiders of the Lost Cone.
