BibTex format
@unpublished{Rapoport:2006,
author = {Rapoport, A and Rom-Kedar, V and Turaev, D},
title = {Supplement to the article "Approximating multi-dimensional Hamiltonian flows by billiards": proof of C0 and Cr - closeness Theorems},
url = {http://arxiv.org/abs/nlin/0612016v1},
year = {2006}
}