user: Question: What is every reference for type and usage of Germanium small-signal RF transistor?
Columns: ['Prefix class', 'Type and usage', 'Example', 'Equivalent', 'Reference']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['AC', 'Germanium small-signal AF transistor', 'AC126', 'NTE102A', 'Datasheet']
SQL:

assistant: SELECT "Reference" FROM "Table" WHERE "Type and usage" = 'Germanium small-signal RF transistor';