How do I properly cite HDF5 in a paper

This is how we recommend citing HDF5:

  The HDF Group. Hierarchical Data Format, version 5, 1997-NNNN.
  https://www.hdfgroup.org/HDF5/.

Where "NNNN" is the current year.

The LaTeX BibRef for this is:

@ONLINE{hdf5,
    author = {{The HDF Group}},
    title = "{Hierarchical Data Format, version 5}",
    year = {1997-NNNN},
    note = {https://www.hdfgroup.org/HDF5/}
}

This is how we recommend citing HDFView:

  The HDF Group. HDF Viewer, version 3.1.3, 2006
  https://www.hdfgroup.org/downloads/hdfview/.