nick5990 I removed your comments from the article and I m glad that you have put them here I moved your signature to the bottom after all your comments I don t have time to investigate at the moment but there are a couple of references Possibly you are saying that references 11 and 12 only verify some fact not directly related to the text as it relates to the topic of this article That would need to be checked Please be patient it may be a few days before anyone looks further