Correction to: Graphs and Combinatorics (2021) 37:1669–1685 https://doi.org/10.1007/s00373-021-02397-4

This article was unintentionally published twice in this journal, by the same authors.

Following should be considered the version of record and used for citation purposes: “Makoto Tagami \(\cdot \) Ryota Hori, Harmonic Index t-Designs in the Hamming Scheme for Arbitrary q, Graphs and Combinatorics, Volume 37, Issue 5, pages 1669–1685, https://doi.org/10.1007/s00373-021-02397-4”.

The duplicate “Makoto Tagami \(\cdot \) Ryota Hori, Harmonic Index t-Designs in the Hamming Scheme for Arbitrary q, Graphs and Combinatorics, Volume 36, Issue 4, pages 1093–1109, https://doi.org/10.1007/s00373-020-02170-z” is to be ignored. Springer apologizes to the readers of the journal for not detecting the duplication during the publication process.

Moreover, the acceptance date was not included in original publication. The acceptance date of the article is April 3, 2020.