Young Suk Bang Abdel-Khalik, H. S., Bang, Y., & Wang, C. (2013). Overview of hybrid subspace methods for uncertainty quantification, sensitivity analysis. ANNALS OF NUCLEAR ENERGY, 52, 28–46. https://doi.org/10.1016/j.anucene.2012.07.020 Bang, Y., & Abdel-Khalik, H. S. (2013). Projection-based second order perturbation theory. ANNALS OF NUCLEAR ENERGY, 52, 80–85. https://doi.org/10.1016/j.anucene.2012.07.009 Bang, Y., Abdel-Khalik, H. S., & Hite, J. M. (2012). Hybrid reduced order modeling applied to nonlinear models. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, 91(9), 929–949. https://doi.org/10.1002/nme.4298 Bang, Y., Wang, C., & Abdel-Khalik, H. S. (2012). State-Based Adjoint Method for Reduced Order Modeling. TRANSPORT THEORY AND STATISTICAL PHYSICS, 41(1-2), 101–132. https://doi.org/10.1080/00411450.2012.672359