The Natural Rate of Interest is Zero. Mathew Forstater and Warren Mosler.
The self-financing state: An institutional analysis of government expenditure, revenue collection and debt issuance operations in the United Kingdom. UCL Institute for Innovation and Public Purpose
What to Do with Modern Money Theory (MMT)? Dirk Ents (paywall)
Modern monetary theory and its critics Multiple authors
The Debt Ratio and Sustainable Macroeconomic Policy. Scott T. Fullwiler
Is Monetary Sovereignty an Option for the Small Open Economy? Christos C. Paraskevopoulos, John Paschakis and John Smithin.
Modern Money Scotland
Organisations (Ecologial Economics)