TY - RPRT TI - First-Order Model Management With Variable-Fidelity Physics Applied to Multi-Element Airfoil Optimization AU - Alexandrov, N. M. AU - Nielsen, E. J. AU - Lewis, R. M. AU - Anderson, W. K. PY - 2000 UR - https://ntrs.nasa.gov/citations/20000097390 ID - 20000097390 ER -