Restricted Hamming–Huffman trees Min C. Lin, Fabiano S. Oliveira, Paulo E. D. Pinto, Moysés S. Sampaio Jr. and Jayme L. Szwarcfiter RAIRO-Oper. Res., 56 3 (2022) 1823-1839 Published online: 30 June 2022 DOI: 10.1051/ro/2022066