Nägler, D.K., Zhang, R., Tam, W., Sulea, T., Purisima, E.O. and Ménard, R. (1999). „Human cathepsin X: A cysteine protease with unique carboxypeptidase activity”. Biochemistry38: 12648-12654. PMID10504234.
Nägler, D.K. and Ménard, R. (1998). „Human cathepsin X: A novel cysteine protease of the papain family with a very short proregion and unique insertions”. FEBS Lett.434: 135-139. PMID9738465.
Santamaría, I. Velasco, G., Pendás, A.M., Fueyo, A. and López-Otín, C. (1998). „Cathepsin Z, a novel human cysteine proteinase with a short propeptide domain and a unique chromosomal location”. J. Biol. Chem.273: 16816-16823. PMID9642240.