Fig. 3, p. 6029, should be corrected to read : We suggest that subscribers photocopy these corrections and insert the photocopies at the appropriate places where the article to be correctcd originally appeared. Authors are urged to introduce these corrections into any reprints they distribute. Secondary (abstract) services are urged to carry notice of these corrections as prominently as they carried the original abstracts.
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Lars Thelander (1971) studied this question.
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