Used to be contained in Jeppesen supplement, ATC section - Germany variations.
Will need to look up where they got their reference from
Jeppesen Airway Manual
STATE RULES AND PROCEDURES - EUROPE
GERMANY
RULES AND PROCEDURES
AVOIDANCE OF WAKE TURBULENCE
f) When taxiing behind an aircraft of higher wake turbulence category a minimum distance of 200m should be kept whenever possible.