Isolated and combined deficiencies of NADH dehydrogenase (complex I) in muscle tissue of children with mitochondrial myopathies. - Korenke,G.C.; Bentlage,H.ACM.; Ruitenbeek,W.; Sengers,R.CA.; Sperl,W.; Trijbels,J.MF. (Eur J Pediatr, 1990)