Positive interference of merthiolate in the TDx digoxin assay in control samples used in the Belgian External Quality Assessment (EQA) Scheme138, Devleeschouwer, N., Libeer J.C., Schiettecatte J., Maes Virginie, Demolder J., Debusschere P.M., and Gorus F. , Eur.J.Clin.Chem.Clin.Biochem., 0/12/1994, Volume 32, Issue 12, Number 937, p.935 - 937, (1994)