The higher-order singular Lagrangian system is treated as field system. Euler-Lagrange equations are solved with some constraints. An example is studied and a comparison with Hamiltonian formulation is done.
FARAHAT, N. I. and HELES, M. R. (2006) "A Treatment of a Higher-Order Singular Lagrangian as Fields System," Turkish Journal of Physics: Vol. 30: No. 2, Article 1. Available at: https://journals.tubitak.gov.tr/physics/vol30/iss2/1