ICHD classification and diagnosis of migraine are further subdivided. Overall ICHD-3 beta distinguishes 29 migraine subtypes. The following table outlines the main subtypes and their ICHD-1, -2, -3 beta and ICD-10 codes. Migraine without aura also referred to as a "common migraine", (previously known as "hemicrania simplex") is a specific neurological disorder characterized by recurrent, throbbing headaches that often affect one side of the head (i.e., it is unilateral), are of at least moderate intensity, and may cause nausea, phonophobia or photophobia. One defining characteristic of the common migraine is a lack of the visual disturbances known as an aura. The exact International Classification of Headache
Known Space novels as books. Some of the shorter novels (novellas) published in magazines were expanded as, or incorporated in, book-length novels. There are also two or three short stories which share common themes and some background elements with "Known Space" stories, but which are not considered a part of the "Known Space" universe: "One Face" (1965) and "Bordered in Black" (1966) —both in the 1979 collection "Convergent Series"—and possibly "The Color of Sunfire", published online and listed here. In the "Known Space" stories, Niven had created a number of technological devices (GP hull, stasis field, Ringworld material) which, combined with the