Tertiary Sources Tertiary sources are publications that summarize and digest the information in primary and secondary sources to provide background on a topic, idea, or event. Encyclopedias and biographical dictionaries are prime examples of tertiary sources.
From Wikipedia, the free encyclopedia. A value-added service (VAS) is a popular telecommunications industry term for non-core services, or in short, all services beyond standard voice calls and fax transmissions. However, it can be used in any service industry, for services available at little or no cost, to promote their primary business.
Vasculitis (CNS) Vasculitis of the central nervous system (CNS) is an autoimmune disorder in which the body mistakes its own blood vessels that supply the brain and spinal cord as a foreign substance and launches antibodies to attack them. It is not known what causes this faulty immune response. Inflammation of the blood vessels prevents blood from flowing to parts of the brain and spinal cord, which can result in damage to the CNS, including: decreased function due to decreased blood flow (ischemia),