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repeated ungrammatical phrase

"of the set the productions" is missing a word. The phrase has been copy-pasted 3 times in the article, and needs to be clarified, please. -- Ancheta Wis   (talk | contribs) 06:26, 16 April 2013 (UTC) reply

The heading ... taken from [5] appears to refer to the Abraham 1965 article. True? __ Ancheta Wis   (talk | contribs) 10:53, 16 April 2013 (UTC) reply

Looks to be the case, the referencing needs improving. Graeme Bartlett ( talk) 10:34, 21 April 2013 (UTC) reply