@article{paperid:1015878,
author = {A. Bahonar and Azizzadeh, Mohammad and M. Stevenson and M. Vojgani and M. Mahmoudi},
title = {Factors Affecting Days Open in Holstein Dairy Cattle in Khorasan Razavi Province, Iran; A Cox Proportional Hazard Model},
journal = {Journal of Animal and Veterinary Advances},
year = {2009},
volume = {8},
number = {4},
month = {April},
issn = {1680-5593},
pages = {747--754},
			numpages = {7},
keywords = {Cox proportional hazard model; frailty term; dairy cows; holstein dairy cattle},
}