https://www.cnb.cz/en/banknotes-and-coins/coins/information/withdrawal-of-10-and-20-heller-coins/index.html
Withdrawal of 10- and 20-heller coins - Czech National Bank
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https://www.cnb.cz/en/monetary-policy/inflation-reports/boxes-and-annexes-contained-in-inflation-reports/The-withdrawal-of-50-heller-coins-and-its-possible-impact-on-prices-00001
The withdrawal of 50-heller coins and its possible impact on prices - Czech National Bank