Wear Behavior Analysis and Gated Recurrent Unit Neural Network Prediction of Coefficient of Friction in Al10Cu-B₄C Composites by Mihail Kolev, Ludmil Drenchev, Veselin Petkov, Rositza Dimitrova, Krasimir Kolev, Boris Yanachkov

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Plant-Based Antigen Production Strategy for SARS-CoV-2 Nucleoprotein and RBD and Its Application for Detection of Antibody Responses in COVID-19 Patients by Katerina Takova, Valeria Tonova, Ivan Minkov, Eugenia S. Mardanova, Nikolai V. Ravin, Stanislav Kotsev, Maria Pishmisheva, Gergana Zahmanova

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Intravenous Immunoglobulins: Mode of Action and Indications in Autoimmune and Inflammatory Dermatoses by Lyubomir A. Dourmishev, Dimitrina V. Guleva, Ljubka G. Miteva

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Solving Advection Equations by Applying the Crank-Nicolson Scheme Combined with the Richardson Extrapolation by Zahari Zlatev, Ivan Dimov, István Faragó, Krassimir Georgiev, Ágnes Havasi, Tzvetan Ostromsky

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Quasilinearization of the Initial Value Problem for Difference Equations with “Maxima” by S. Hristova, A. Golev, K. Stefanova

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LONG-TERM FORECASTING OF THE SPA AND WELLNESS SUBSECTOR OF THE BULGARIAN TOURISM INDUSTRY by PRESLAV DIMITROV

“…In the past twelve years Bulgaria has managed to capitalize on the good results achieved in certain subsectors of its tourism industry, such as the spa and wellness industry. …”
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MODELING OF SOLAR RADIATION WITH A NEURAL NETWORK by VALENTIN STOYANOV, IVAYLO STOYANOV, TEODOR ILIEV

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CRITICAL INFRASTRUCTURE PROTECTION - STRATEGIC OPPORTUNITIES by Georgi Pavlov, Teodora Gechkova, Tiana Kaleeva

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Monotone-iterative technique of Lakshmikantham for the initial value problem for a differential equation with a step function by S. G. Hristova, M. A. Rangelova

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Dynamics of a Self-Excited Vibrating Thermal Energy Harvester with Shape Memory Alloys and PVDF Cantilevers by Ivo Yotov, Georgi Todorov, Elitsa Gieva, Todor Todorov

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Foreign Bodies in Lower Airway in Children: Brief Review and Clinical Experience by Stoyan Markov, Petya Markova, Ivanka Karavelikova, Hristina Halacheva

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Comparison of the Effect of New Spice Freon Extracts Towards Ground Spices and Antioxidants for Improving the Quality of Bulgarian-Type Dry-Cured Sausage by Balev Dessislav Kostadinov, Nenov Neno Stefanov, Dragoev Stefan Georgiev, Vassilev Kiril Petrov, Vlahova-Vangelova Dessislava Borislavova, Baytukenova Sholpan Baydildaevna, Smolnikova Farida Haripovna

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Corrosion of Low-Alloy Steel in Ethanolamine Steam Generator Chemistry—The Effect of Temperature and Flow Rate by Iva Betova, Martin Bojinov, Vasil Karastoyanov

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Finite and Infinte Time Blow Up of Solutions to Wave Equations with Combined Logarithmic and Power-Type Nonlinearities by Milena Dimova, Natalia Kolkovska, Nikolai Kutev

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Supplement 3 Section Varia by Maria Titopoulou, M. Nikolova

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Supplement 2 Section Dental Medicine by Christiana Madjova, Iliyana Atanasova

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Effects of γ-Irradiation of Wild Thyme (Thymus serpyllum L.) on the Phenolic Compounds Profile of Its Ethanolic Extract by Janiak Michał A., Slavova-Kazakova Adriana, Kancheva Vessela D., Ivanova Milena, Tsrunchev Tsvetelin, Karamać Magdalena

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Electrochemical Method for the Assay of Organic Peroxides Directly in Acetonitrile by Vanina Ivanova, Mariya Pimpilova, Maria Stoyanova, Nina Dimcheva

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Red Beetroot Juice Phytochemicals Bioaccessibility: an In Vitro Approach by Ivelina Deseva, Magdalena Stoyanova, Nadezhda Petkova, Dasha Mihaylova

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A rare case of Ewing's sarcoma in a 4-year-old child treated by tumor endoprosthetics using 3D printing by Vladimir Stavrev, Luben Stokov, Petko Ganev, Georgi Georgiev

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