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https://scholar.afit.edu/facpub/2974/ "Spline-Based Factor-Graph Optimization with High-Grade Inertial Sensor" by Kyle Leland, Clark N.... Inertial measurement units (IMUs) are central to global navigation satellite system-based and alternative navigation solutions. This paper combines three lines... factor graph high grade inertial sensor leland clark spline https://www.usgennet.org/usa/wi/county/clark/0data/6/6586.htm Hebert, Leland C. (1923 - 2003), Clark County, Wisconsin History & Genealogy clark county hebert leland wisconsin history