Ivan Georgiev is Professor of Mathematical Modelling at the Institute of Information and Communication Technologies, Bulgarian Academy of Sciences. He received a Master's degree in Mathematics from Sofia University St. Kliment Ohridski and a PhD in Computational Mathematics from the Bulgarian Academy of Sciences. His research interests are in mathematical modelling, numerical simulations, 3D digitization and microstructural analysis. Hristo Kostadinov was born in Sofia, Bulgaria, in 1974. He received the B. Sc. degree and M. Sc. degree in 1998, and 2001, respectively at Sofia University, Sofia, Bulgaria. In March 2005, he received his Ph. D. degree at the University of Electro-Communications, Tokyo, Japan. Since 2012 he is Associate Professor at the Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences. His research interests are in coding theory, information and communication theory, signals, blockchain and internet of things.Elena Lilkova is an Associate Professor of Applied Mathematics in Computational Physics and Biology at the Institute of Information and Communication Technologies, Bulgarian Academy of Sciences. She has a PhD in Atomic and Molecular Physics from Sofia University. Her research interests include computational modeling of biological macromolecules and their interactions, enhanced sampling techniques, methods for free energy estimation, and the development of new methods and protocols for more effective study of macromolecular interactions.

• 1. Todorka Alexandrova, Hristo Kostadinov, Nikolai L. Manev, Watermarking Audio Content: \\Data Embedding based on Fast Fourier Transform.- 2. Vera Angelova, Residual bounds of a class of nonlinear matrix equations.- 3. Atanas Atanasov, Slavi Georgiev, Lubin Vulkov, Parameter Identification Analysis of Food and Population Dynamics in Honey Bee Colonies.- 4. Vilislav Boutchaktchiev, Forecasting Models for the House Price Index in Bulgaria.- 5. Yadi Cheng, Xubiao Peng, Peicho Petkov, Nevena Ilieva, Studying the geometry and dynamics of prospective Parkinson-inhibitor MCoCP4 variants with modified grafting topologies.- 6. Hristo Chervenkov and Kiril Slavov, ETCCDI Precipitation\hyp{}based Climate Indices in the CMIP5 Future Climate Projections over Southeast Europe.- 7. Zlatinka Dimitrova, Nikolay K. Vitanov, Simple Equations Method for obtaining exact solutions of nonlinear differential equations with polynomial or nonpolynomial nonlinearity.- 8. Tihomir Gyulov, Lubin Vulkov, Reconstruction of the Lmped Water-to-Air Mass Transfer Coefficient from Final Time or Time-Averaged Concentration Measurement in a Model of Porous Media.- 9. Ivan Hristov, Radoslava Hristova, Igor Puzynin, Taisia Puzynina, Zarif Sharipov, Zafar Tukhliev, Newton's method for computing periodic orbits of the planar three-body problem.-   10. Miglena Koleva, Zorica Milovanovi\'c Jekni\'c, Lubin Vulkov, Determination of External Boundary Conditions of a Stationary Nonlinear Problem on Disjoint Intervals at Point Observation.- 11. Elena Lilkova, Peicho Petkov, Nevena Ilieva, Leandar Litov, Modelling the Interaction of the hIFN$\gamma$ C-terminal Peptide and HS-derived Octasaccharides.- 12. Tzvetan Ostromsky, Implemenation, performance and scalability of a large scale air pollution model on the new EuroHPC petascale supercomputer DISCOVERER in Bulgaria.- 13. Peicho Petkov, Nevena Ilieva, Elena Lilkova, Leandar Litov, Partitioning of Putative Antimicrobial Peptides into a Model Bacterial Membrane: a Metadynamics Approach.- 14. Angela Slavova, Ventsislav Ignatov, Bioinspired systems working on the edge of chaos.- 15. Juri Kandilarov, Lubin Vulkov, Simultaneous Numerical Reconstruction of Time-dependent Convection Coefficient and Source in Magnetohydrodynamics Flow System.- 16. Maria Zarcheva, Tihomir Ivanov, Numerical simulations of the process of adsorption onto activated carbon in water treatment applications.