https://www.bundesbank.de/en/statistics/money-and-capital-markets/interest-rates-and-yields/daily-yields-on-debt-securities-outstanding-issued-by-residents-by-residual-maturity-651576
Money and capital markets
debt securitiesdailyyieldsoutstandingissued
https://www.econstor.eu/handle/10419/178621
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government debteconstorgapfillingmaturity