O.E. Barndorff-Nielsen, P. Blaesuld, and .s.Eriksen: Decompsition and Invariance of Measures, and Satistical Tranformation Models. Lecure Note in Statistics, No. 58, Springer-Verlag, New York, Berlin and Heidelberg 989, 147 pp., ISBN 0-387-7131-9 and 3-540-97131-9, DM 36,-.