Ruzhansky M. Pseudo-Differential operators and symmetries : background analysis and advanced topics / M. Ruzhansky, V. Turunen, 2010 r=on-line. - Текст : электронный.
Modern Aspects of the Theory of Partial Differential Equations : сборник / edited by Michael Ruzhansky, Jens Wirth., 2011 r=on-line. - Текст : электронный.