Lovejoy, S., Agterberg, F., Carsteanu, A., Cheng, Q., Davidsen, Jörn, Gaonac'h, H., Gupta, V., L'Heureux, I., Liu, William, Morris, S.W., Sharma, S., Shcherbakov, R., Tarquis, A., Turcotte, D. and Uritsky, V.. Nonlinear geophysics: why we need it 90.455 2009.