Chan, Tan, Zhang et al.: "F1Aalpha, a death receptor-binding protein homologous to the Caenorhabditis elegans sex-determining protein, FEM-1, is a caspase substrate that mediates apoptosis." in: The Journal of biological chemistry, Vol. 274, Issue 45, pp. 32461-8, 1999 (PubMed).
Yan, Bienkowski, Shuck et al.: "Membrane-anchored aspartyl protease with Alzheimer's disease beta-secretase activity." in: Nature, Vol. 402, Issue 6761, pp. 533-7, 1999 (PubMed).
Sinha, Anderson, Barbour et al.: "Purification and cloning of amyloid precursor protein beta-secretase from human brain." in: Nature, Vol. 402, Issue 6761, pp. 537-40, 1999 (PubMed).