Muonic atom spectroscopy with microgram target material A. Adamczak, A. Antognini, N. Berger, T. E. Cocolios, N. Deokar, Ch. E. Düllmann, A. Eggenberger, R. Eichler, M. Heines, H. Hess et al. (19 more) Eur. Phys. J. A, 59 2 (2023) 15 Published online: 03 February 2023 DOI: 10.1140/epja/s10050-023-00930-y