Greybody factors and quasinormal modes for a nonminimally coupled scalar field in a cloud of strings in (2 + 1)-dimensional backgroundÁngel Rincón and Grigoris PanotopoulosEur. Phys. J. C, 78 10 (2018) 858DOI: https://doi.org/10.1140/epjc/s10052-018-6352-5