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Doujinshi (同人誌), also romanized as dōjinshi, is the Japanese term for self-published print works, such as magazines, manga, and novels. Part of a wider category of doujin (self-published) works, doujinshi are often derivative of existing works and created by amateurs, though some professional artists participate in order to publish material outside the regular industry. Groups of doujinshi artists refer to themselves as a sākuru. Several such groups actually consist of a single artist: they are sometimes called kojin sākuru. Since the 1980s, the main method of distribution has been through regular doujinshi conventions, the largest of which is called Comiket held in the summer and winter in Tokyo's Big Sight. At the convention, over 20 acres (81,000 m2) of doujinshi are bought, sold, and traded by attendees.