Bonorden, O., Degener, B., Kempkes, B., &; Pietrzyk, P. (2009). Complexity and Approximation of a Geometric Local Robot Assignment Problem. In Algorithmic Aspects of Wireless Sensor Networks (pp. 252–262). Berlin, Heidelberg: Springer.https://doi.org/10.1007/978-3-642-05434-1_25