1. Arnol'd, V. I., , Ordinary Differential Equations, MIT Press, Cambridge, Mass., 1973,
2. Magnetic reconnection;Axford,1984
3. Birkhoff, G., , G.-G., Rota, , Ordinary Differential Equations, Blaisdell, Waltham, Mass., 1969,
4. Field line motion in the presence of finite conductivity;Birmingham,1972
5. Hamiltonian representation of divergence-free fields;Boozer,1984