E. K. Burke, P. De Causmaecker, G. V. Berghe and H. Van Landeghem, “The state of the art of nurse rostering,” Journal of Scheduling, 7, pp. 441-499, 2004.
G. Baskaran, A. Bargiela and R. Qu, “Integer programming: Using branch and bound to solve the nurse scheduling problem,” In Proceedings of 2014 International Conference on Artificial Intelligence and Manufacturing Engineering, pp. 203-209, 2014.