Stable-isotope dilution analysis of D- and L-2-hydroxyglutaric acid: application to the detection and prenatal diagnosis of D- and L-2-hydroxyglutaric acidemias. - Gibson,K.M.; ten Brink,H.J.; Schor,D.S.; Kok,R.M.; Bootsma,A.H.; Hoffmann,G.F. (Pediatr Res, 1993)