James O. Ramsay, Differential Equation Models for Statistical Functions, The Canadian Journal of Statistics / La Revue Canadienne de Statistique, Vol. 28, No. 2 (Jun., 2000), pp. 225-240 ...

The nonlinear second order differential equation satisfied by the homogeneous function y = [ aum + mbujv n + cvm ]k/m, m = j + n, is obtained. Functions u and v satisfy independently the linear ...