1. K. Arentsen, and E. Stromgren (1959 ): Patients in Danish sychiatric hospitals. Universitesforlaget, Aarhus, and Munksgaard, Copenhagen.
2. A CUMULATIVE NATIONAL PSYCHIATRIC REGISTER: ITS STRUCTURE AND APPLICATION
3. N. Juel-Nielsen, and E. Stromgren (1963 ): Five years later. Universitesforlaget, Aarhus, and Munksgaard, Copenhagen.
4. N. Juel-Nielsen, and E. Strogren (1969 ): Ten years later. Universitetsforlaget, Aarhus, and Munksgaard, Copenhagen.