https://books.google.gr/books?id=rSDSBwAAQBAJ&pg=PA234&lpg=PA234&dq=Emil+Krebs+jewish&source=bl&ots=cYDdjOnYs3&sig=I3SnBZVmSaccHykZZhJoImyDs_U&hl=el&sa=X&ved=0ahUKEwiJ1prUo7LTAhWQZFAKHSrnDmcQ6AEIYjAI#v=onepage&q=Emil%20Krebs%20jewish&f=false