Letters are subject to an editorial examination faster than papers.
Authors are requested to certify that there is no such prior or pending publication. Copyright of papers accepted for publication will be transferred to AEI-ETT 1. Formal Preparation of Manuscripts 1.1 Texts 1.1.1 Texts to be submitted to ETT must be written in English and typed with line spacing one and a half. All text pages should be numbered. Figures should be used sparingly and repetitive results avoided.