Garcia-Huidobro, M., Manásevich, R., & Mawhin, J. (2013). Existence of solutions for a 1-D boundary value problem coming from a model for burglary. Nonlinear Analysis: Real World Applications, 14(5), 1939-1946. https://doi.org/10.1016/j.nonrwa.2013.01.005 (Original work published 2013)