Bird Observation System SEMMERZAKE. Further Steps and Improvements.
DuPont, G. 1986. Bird Observation System SEMMERZAKE. Further Steps and Improvements. Proceedings of the International Bird Strike Committee, Copenhagen, Denmark IBSC18/WP16:182-189.
DuPont, G. 1986. Bird Observation System SEMMERZAKE. Further Steps and Improvements. Proceedings of the International Bird Strike Committee, Copenhagen, Denmark IBSC18/WP16:182-189.
