TY - RPRT TI - Efficiency Improvements to the Displacement Based Multilevel Structural Optimization Algorithm AU - Plunkett, C. L. AU - Striz, A. G. AU - Sobieszczanski-Sobieski, J. PY - 2001 UR - https://ntrs.nasa.gov/citations/20010097760 ID - 20010097760 ER -