... Short Research Article. Use of simple stable labelled intermediates to produce complex isotopically labelled internal standards †. Paul Allen,; Mike Hickey,; Lee Kingston * ,; Andrew Mather and; David J. Wilkinson. Article first published online: 30 JUL 2007. ... How to Cite. Allen, P., Hickey, M., Kingston, L., Mather, A. and Wilkinson, DJ (2007), Use of simple stable labelled intermediates to produce complex isotopically labelled internal standards. ...