1. Fermat’s principle of least time predicts refraction of ant trails at substrate borders;Oettler,2013
2. Natural process natural selection;Sharma;Biophys. Chem.,2007
3. Classical Mechanics;Goldstein,1959
4. Hamilton’s Principle in Continuum Mechanics;Bedford,1985
5. Lagrangian and Hamiltonian Mechanics;Calkin,1996