Gamiz, M.L., Mammen, E., Martinez-Miranda, M.D. and Nielsen, J.P.(2016). Double one-sided cross-validation of local linear hazards. Journal of the Royal Statistical Society B, 78, 755-779.
Spreeuw, J., Nielsen, J. P. and Jarner, S. F. (2013). A visual test of mixed hazard models,
SORT, 37, 149-??170.