Operator Theory in Different Settings and Related Applications 26th IWOTA, Tbilisi, July 2015 - Duduchava, Roland; Duduchava, Roland; Kaashoek, Marinus A.; Kaashoek, Marinus A.; Vasilevski, Nikolai; Vasilevski, Nikolai; Vinnikov, Victor; Vinnikov, Victor (Springer International Publishing : Imprint: Birkhäuser, 2018)