synchronized SortedMap<Address, List<Reference>> getFunctionDataReferences() {

			if (references != null) {
				return references;
			}

			references = getSortedVariableReferences(cachedFunction);
			return references;
		}
Construct a reference iterator sorted on the from address.
@param set set of from addresses
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/references/ReferenceDBManager.java