Della Croce, F., Paschos, V. T. and Calvo, R. W. (2010) “Approximating the metric 2-Peripatetic Salesman Problem”, Algorithmic Operations Research, 5(1), pp. Pages 13 – 20. Available at: https://journals.lib.unb.ca/index.php/AOR/article/view/11496 (Accessed: 23 November 2024).