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Publications by Andis Kalvans
Twenty-Three Unsolved Problems in Hydrology (UPH) – A Community Perspective
Hydrological Sciences Journal
Water Science
Technology
Geochemical Classification of Groundwater Using Multivariate Statistical Analysis in Latvia
Nordic Hydrology
Water Science
Technology
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Unsolved Problems in Combinatorial Games
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Solved and Unsolved Problems
EMS Newsletter
Solved and Unsolved Problems
EMS Newsletter
Inside the Sun: Unsolved Problems
International Astronomical Union Colloquium
Some Unsolved Problems in Number Theory
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Electrical Progress and Its Unsolved Problems
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