Tracing the Milky Way warp and spiral arms with classical Cepheids B. Lemasle, H. N. Lala, V. Kovtyukh, M. Hanke, Z. Prudil, G. Bono, V. F. Braga, R. da Silva, M. Fabrizio, G. Fiorentino et al. (3 more) A&A, 668 (2022) A40 Published online: 01 December 2022 DOI: 10.1051/0004-6361/202243273