Serial publications covering and intended to reach a specific industry, trade or type of business. These publications usually are a magazine type of periodical with articles on topical subjects, news items and advertisements that appeal to those in the field. Trade journals are seldom refereed and do not always have an editorial board. Abstracts are usually short or nonexistent and few or no references are given. Usually an ISSN is available. Trade journals are included in Scopus because users and librarians consider selected articles to be scientifically relevant. Only articles or reviews of scientific relevance are included in Scopus.