Key points are not available for this paper at this time.
Correction to The Annals of Statistics (1989) 17 1749--1766 URL: http://links.jstor.org/sici?sici=0090-5364%28198912%2917%3A4%3C1749%3AEPEFSP%3E 2.0.CO%3B2-9
Rainer Dahlhaus (Sat,) studied this question.
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