B. Abrahamshrauner et al., INTEGRATION OF 2ND-ORDER ORDINARY DIFFERENTIAL-EQUATIONS NOT POSSESSING LIE POINT SYMMETRIES, Physics letters. A, 203(4), 1995, pp. 169-174
A class of integrable second order ordinary differential equations not
possessing Lie point symmetries is shown to be rich in nonlocal symme
tries which provide one route for integration and to have general solu
tions which are uniform functions.