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Your search - q=q%3Dq%253Dhttps://scholar.google.com/scholar_url%25253Furl%25253Dhttps://www.sciencedirect.com/science/article/pii/0008884690900494%252526hl%25253Den%252526sa%25253DX%252526ei%25253D2SkGZpntJZeTy9YPp82Q0AY%252526scisig%25253DAFWwaebzSSjHP4a-ReFnZI__-HL-%252526oi%25253Dscholarr - did not match any documents. Suggestions: Make sure all words are spelled correctly. Try different keywords. Try more general keywords.