@article{article2503ca01,
title   = {Cryopreservation of an avian spirochete strain in liquid nitrogen},
author = {Labruna, Marcelo Bahia and Resende, J. S. and Martins, N. R. S. and Jorge, M. A.},
year = {1999},
doi = {10.1590/S0102-09351999000600008},
journal   = {Arquivo Brasileiro de Medicina Veterinária e Zootecnia}
}