@article{:/content/journals/10.22233/20412495.0109.10, author = "Sparkes, Andrew", title = "How to…", journal = "BSAVA Companion", year = "2009", volume = "2009", number = "1", eid = , pages = "10-13", url = "https://www.bsavalibrary.com/content/journals/10.22233/20412495.0109.10", doi = "https://doi.org/10.22233/20412495.0109.10" }