Silva, H.G., Oliveira, M.M., Serrano, C., Bezzeghoud, M., Reis, A.H., Rosa, R.N. and Biagi, P.F. 2012. Influence of seismic activity on the atmospheric electric field in Lisbon (Portugal) from 1955 to 1991. Annals of Geophysics. 55, 1 (Apr. 2012). DOI:https://doi.org/10.4401/ag-5361.