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The authors are indebted to Jan Brandts for fruitful suggestions.
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Supported by the Czech Academy of Sciences (RVO: 67985840).
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Chleboun, J., Křížek, M., Segeth, K. et al. Professor Ivo Babuška, founder of Applications of Mathematics, passed away. Appl Math 68, 377–386 (2023). https://doi.org/10.21136/AM.2023.0108-23
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DOI: https://doi.org/10.21136/AM.2023.0108-23