What is every reference for type and usage of Germanium small-signal RF transistor?
CREATE TABLE table_31422 (
    "Prefix class" text,
    "Type and usage" text,
    "Example" text,
    "Equivalent" text,
    "Reference" text
)
SELECT "Reference" FROM table_31422 WHERE "Type and usage" = 'Germanium small-signal RF transistor'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is every reference for type and usage of Germanium small-signal RF transistor? ### Input: CREATE TABLE table_31422 (
    "Prefix class" text,
    "Type and usage" text,
    "Example" text,
    "Equivalent" text,
    "Reference" text
) ### Response: SELECT "Reference" FROM table_31422 WHERE "Type and usage" = 'Germanium small-signal RF transistor'