**Topological Singularities in Acoustic Fields due to Absorption of a Crystal**

V. I. Alshits1,2, V. N. Lyubimov1 and A. Radowicz3  *1A.V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, 2Polish-Japanese Institute of Information Technology, Warsaw, 3Kielce University of Technology, Kielce 1Russia 2,3Poland* 
