Letters are for fast publication of new and interesting results, limited to six printed pages.
Three copies, one original and two duplicates, must be submitted, each complete with an abstract, tables, figures and references. Submission is a representation that the manuscript neither has been published previously nor is currently submitted for publication elsewhere. The abstract should be confined to one typewritten page, preceded by the title of the paper and the names of authors and their addresses. Captions of figures should be collected on a separate sheet. Each photograph should have good black and white contrast.