Yang, Ping, and Yao-Lin Jiang. “H2 Optimal Model Reduction of Coupled Systems on the Grassmann Manifold”. Mathematical Modelling and Analysis 22, no. 6 (November 27, 2017): 785–808. Accessed August 14, 2025. https://transport.vilniustech.lt/index.php/MMA/article/view/927.