© 2017 SIAM. Published by SIAM under the terms
 of the Creative Commons 4.0 license: https://creativecommons.org/licenses/by/4.0/
Except where otherwise noted, this item's license is described as © 2017 SIAM. Published by SIAM under the terms of the Creative Commons 4.0 license: https://creativecommons.org/licenses/by/4.0/