Ambartsumyan, Ilona, Boukaram, Wajih, Bui-Thanh, Tan, Ghattas, Omar, Keyes, David, Stadler, Georg, Turkiyyah, George, and Zampini, Stefano. Hierarchical Matrix Approximations of Hessians Arising in Inverse Problems Governed by PDEs. Retrieved from https://par.nsf.gov/biblio/10288552. SIAM Journal on Scientific Computing 42.5 Web. doi:10.1137/19M1270367.

Ambartsumyan, Ilona, Boukaram, Wajih, Bui-Thanh, Tan, Ghattas, Omar, Keyes, David, Stadler, Georg, Turkiyyah, George, & Zampini, Stefano. Hierarchical Matrix Approximations of Hessians Arising in Inverse Problems Governed by PDEs. SIAM Journal on Scientific Computing, 42 (5). Retrieved from https://par.nsf.gov/biblio/10288552. https://doi.org/10.1137/19M1270367

Ambartsumyan, Ilona, Boukaram, Wajih, Bui-Thanh, Tan, Ghattas, Omar, Keyes, David, Stadler, Georg, Turkiyyah, George, and Zampini, Stefano. "Hierarchical Matrix Approximations of Hessians Arising in Inverse Problems Governed by PDEs". SIAM Journal on Scientific Computing 42 (5). Country unknown/Code not available. https://doi.org/10.1137/19M1270367. https://par.nsf.gov/biblio/10288552.

@article{osti_10288552,
place = {Country unknown/Code not available}, title = {Hierarchical Matrix Approximations of Hessians Arising in Inverse Problems Governed by PDEs}, url = {https://par.nsf.gov/biblio/10288552}, DOI = {10.1137/19M1270367}, abstractNote = {}, journal = {SIAM Journal on Scientific Computing}, volume = {42}, number = {5}, author = {Ambartsumyan, Ilona and Boukaram, Wajih and Bui-Thanh, Tan and Ghattas, Omar and Keyes, David and Stadler, Georg and Turkiyyah, George and Zampini, Stefano}, editor = {null} }