Peter Benner, Stefano Grivet-talocia, Alfio Quarteroni, Gianluigi Rozza, Wil Schilders, Luís Miguel Silveira (2021) 1 Model order reduction: basic concepts and notation, In: Model Order Reduction. Volume 1: System- and Data-Driven Methods and Algorithms, pp. 1-14, ISBN: 9783110498967