Authors must submit papers reporting on original, unpublished work that is not being considered for publication elsewhere. Manuscripts have to be submitted in triplicate.
Authors bear full responsibility for the content of their published papers.
Manuscripts must be accompanied by the Copyright Transfer Statement . The form is regularly published in this journal. The corresponding author will receive two copies of the issue in which the paper is published free of charge. Offprints of each paper can be purchased at the time proofs are returned. Manuscript preparation 1.