TY  - RPRT
TI  - A scalable matrix-free spectral element approach for unsteady PDE constrained optimization using PETSc/TAO
AU  - Marin, Oana
AU  - Constantinescu, Emil
AU  - Smith, Barry
PY  - 2020
DO  - 10.1016/j.jocs.2020.101207
UR  - https://www.osti.gov/biblio/1776612
ID  - 1776612
ER  -