What is the research interest of the academician of the Serbian Academy of Sciences and Arts, who published Series expansions in Fréchet spaces and their duals, construction of Fréchet frames?
functional analysis, generalized functions and hyperfunctions, pseudo-differential operators, time–frequency analysis, linear and nonlinear equations with singularities, probability theory and stochastic processes, applications of mathematics in mechanics with applications in medicine
authored by Stevan Pilipovic. Sanja Atanasova et al.: Characterization of Wave Fronts of Ultradistributions Using Directional Short-Time Fourier Transform. (1921). Marko Janev et al.: Fully fractional anisotropic diffusion for image denoising. (2011) authored by Stevan Pilipovic Inst. Probability theory and stochastic processes.
[INST]
Utilize the provided context information, to generate answers to the following question: 
- Generate the answer to the question based on the provided context.
- Avoid including any explanations or apologies in your responses.
- Only respond to questions that ask for the answer to the target question without any additional information.
- Strictly provide the answer without any additional text.
Question: What is the research interest of the academician of the Serbian Academy of Sciences and Arts, who published Series expansions in Fréchet spaces and their duals, construction of Fréchet frames?
Context: authored by Stevan Pilipovic. Sanja Atanasova et al.: Characterization of Wave Fronts of Ultradistributions Using Directional Short-Time Fourier Transform. (1921). Marko Janev et al.: Fully fractional anisotropic diffusion for image denoising. (2011) authored by Stevan Pilipovic Inst. Probability theory and stochastic processes.
[/INST] Answer:
