Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model
B.~P. Abbott, R. Abbott, T.~D. Abbott, S. Abraham, F. Acernese, K. Ackley, C. Adams, R.~X. Adhikari, V.~B. Adya, et al
December 2019