1. J. Mazzoli, (Transmecánica S.A, Argentina, Ion Bond Member), private communication
2. T. Kawabe, (IAS, United Nations University/University of Tsukuba), Private communication
3. U. Schneider, T. Dolan, (Physics Section, IAEA), Private communication
4. P.I. John, A. Sen, (Institute for Plasma Research, Bhat, India), Private communication
5. Private communication with the following persons is acknowledged: I. Hwie Tan (INPE, Brazil), A. Ribeiro Franco Jr. (USP, Brazil), A. Devia Cubillos (UN-Manizales, Colombia), M. Arroyave Franco (UN-Manizales, Colombia), E. Ariza Avila (UIS, Colombia), A. Gaona Couto (UASLP, México), B. González Rolón (UG, Mexico), J. Nakamatsu (PUCP, Perú), R. Marotti (UDELAR, Uruguay), M. Cruz (UCV, Venezuela)