Cite
MLA Citation
Theodor Adrian Balan and Hein Putter. “Nonproportional hazards and unobserved heterogeneity in clustered survival data: When can we tell the difference?.” Statistics in medicine, vol. 38, 2019, pp. 3405–3420. http://access.bl.uk/ark:/81055/vdc_100086847373.0x00004d