Two circles and only a straightedge
A. Akopyan, R. Fedorov, Proceedings of the American Mathematical Society 147 (2019) 91–102.

Raw behavioral data
R.M. Merrill, P. Rastas, S.H. Martin, M.C. Melo Hurtado, S. Barker, J. Davey, W.O. Mcmillan, C.D. Jiggins, (2019).

Multiple chromosomal rearrangements in a hybrid zone between Littorina saxatilis ecotypes
R. Faria, P. Chaube, H.E. Morales, T. Larsson, A.R. Lemmon, E.M. Lemmon, M. Rafajlovi, M. Panova, M. Ravinet, K. Johannesson, A.M. Westram, R.K. Butlin, Molecular Ecology 28 (2019) 1375–1393.

Feedback-induced self-oscillations in large interacting systems subjected to phase transitions
D. De Martino, Journal of Physics A: Mathematical and Theoretical 52 (2019).

Ephrin- controls excitatory synapse density through cell-cell competition for EphBs
N.T. Henderson, S.J. Le Marchand, M. Hruska, S. Hippenmeyer, L. Luo, M.B. Dalva, ELife 8 (2019).