1. Angelsen BAJ, Kristoffersen K, Torp H. 2 D-flow Imaging with an Annular Array Scanner. 2 nd Int. Congress on Cardiac Doppler, (Abstract)Kyoto 1986
2. Linker D.T., Skjerpe T, Samstad S, Rossvoll O, Chapman J.V., Kristoffersen K, Angelsen B.A.J. Color Flow Mapping with an Annular Array Transducer: An Approach Integrated with CW and Pulsed Doppler in Adult and Pediatric Patients. 2nd International Congress on Cardiac Doppler (Abstract), Kyoto 1986
3. Angelsen B.A.J., Torp H, Kristoffersen. Technical Principles and Approaches to Color Doppler Flow Imaging. 7th Symposium on Echocardiography (Abstract), Rotterdam 1987
4. Linker D.T., Rossvoll O, Chapman J.V., Angelsen B.A.J. Sensitivity and Speed of CFM verses CW Doppler in the Detection of VSD. 7th Symposium on Echocardiography (Abstract), Rotterdam 1987
5. Linker D, Angelsen B.A.J. Johansen H.C., Lønstad H., Torp H. Computer Analysis of 2D Tissue and Flow Images.(Abstract) Heart and Vessels Supplement 3: 1–52 1987