"Linear Models of Viral Propagation" was a research paper written by Doctor Katherine Pulaski early in her medical career, on the way in which viruses spread throughout the body. It was considered to be ground-breaking, and became the standard on the subject.
By 2365, the paper was still held up as the standard on its subject matter. Realizing that the woman she was speaking to had authored that paper convinced Dr. Sara Kingsley that there was nobody better to speak to regarding their unexplained outbreak. (TNG: "Unnatural Selection")