The Identifiability of the Competing Risks Model
James J. Heckman, Bo E. Honore
Biometrika, Vol. 76, No. 2. (Jun., 1989), pp. 325-330.
Stable URL: http://links.jstor.org/sici?sici=0006-3444%28198906%2976%3A2%3C325%3ATIOTCR%3E2.0.CO%3B2-F