A model for the formation of "optimal" vortex rings with taking into account viscosityKaplanski, Felix; Rudi, Ülo21st International Congress of Theoretical and Applied Mechanics : August 15-21, 2004, Warsaw, Poland : ICTAM04 : abstracts and CD-ROM proceedings2004 / p. 189 https://pubs.aip.org/aip/pof/article/17/8/087101/361381/A-model-for-the-formation-of-optimal-vortex-rings

Hidden and driven solitons in microstructured mediaSalupere, Andrus; Engelbrecht, Jüri21st International Congress of Theoretical and Applied Mechanics : August 15-21, 2004, Warsaw, Poland : ICTAM04 : abstracts and CD-ROM proceedings2004 / p. 278 http://fluid.ippt.gov.pl/ictam04/text/sessions/docs/SM11/11813/SM11_11813.pdf

On the propagation of solitary waves in microstructured solidsIlison, Olari; Salupere, Andrus21st International Congress of Theoretical and Applied Mechanics : August 15-21, 2004, Warsaw, Poland : ICTAM04 : abstracts and CD-ROM proceedings2004 / p. 275

Wave propagation in functionally graded materialsBerezovski, Arkadi; Engelbrecht, Jüri; Maugin, Gerard21st International Congress of Theoretical and Applied Mechanics : August 15-21, 2004, Warsaw, Poland : ICTAM04 : abstracts and CD-ROM proceedings2004 / p. 266