R. Nielsen

Intellectual impairment and cerebral atrophy. A psychological, neurological and radiological investigation.

P. Thygesen, R. Willanger, R. Nielsen, 1968, Danish medical bulletin.

Encephalographic Ventricular Atrophy

P. Thygesen, R. Willanger, R. Nielsen, 1966, Acta radiologica: diagnosis.

Primary and Secondary Displacement of Central Venous Catheters

T. Lang-Jensen, M. B. Sørensen, E. Jacobsen, 1980, Acta anaesthesiologica Scandinavica.