@article{Gill1990,
author = {Gill, R.D. and Johansen, S.},
title= {A Survey of Product-Integration with a View Toward Application in Survival Analysis},
year = {1990},
doi = {10.1214/aos/1176347865},
journal = {The Annals of Statistics},
volume = {18},
number = {4},
pages = {1501--1555},
}