Evolution of globular-cluster systems of ultra-diffuse galaxies due to dynamical friction in MOND gravityMichal Bílek, Hongsheng Zhao, Benoit Famaey, Oliver Müller, Pavel Kroupa and Rodrigo IbataA&A, 653 (2021) A170DOI: https://doi.org/10.1051/0004-6361/202140700