Bankwitz, P. External Organizations;
Bankwitz, E. External Organizations;
Frischbutter, A. External Organizations;
,
Bankwitz, P., Bankwitz, E., Frischbutter, A. (1982): Lineamenty na territorii Germanskoĭ Demokraticheskoĭ Respubliki. - Issledovanie Zemli iz Kosmosa, 2, 25-26.