Dr. Dieter EngelsPost-doctoral scientific staff (retired)AddressUniversity of HamburgGojenbergsweg 11221029 HamburgOfficeDirektorenvillaRoom: 010ContactTel: +49 40 42838-8536Email: dieter.engels"AT"uni-hamburg.deScientific activities Database of Circumstellar Masers Nancay 1612 MHz monitoring of OH/IR stars