Admiral Doenitz Complains about Phantom Ship (sources)
Breverton's 196
1947 - https://books.google.com/books?id=6TXVAAAAMAAJ&q=Doenitz+ghost&dq=Doenit...
Breverton's 196
1947 - https://books.google.com/books?id=6TXVAAAAMAAJ&q=Doenitz+ghost&dq=Doenit...