To cite the reanalyses data (covariates), please use:

  Service CCC (2017). “ERA5: Fifth Generation of ECMWF Atmospheric
  Reanalyses of the Global Climate.” Copernicus Climate Change Service
  Climate Date Store (CDS). date of access: June 2019.

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {{ERA}5: {F}ifth Generation of {ECMWF} Atmospheric Reanalyses of the Global Climate},
    author = {Copernicus Climate Change Service},
    howpublished = {Copernicus Climate Change Service Climate Date Store (CDS)},
    note = {date of access: June 2019},
    year = {2017},
  }

To cite the lightning data (observations), please use:

  Schulz, W, Cummins, K, Diendorfer, G, Dorninger, M (2005).
  “Cloud-to-Ground Lightning in Austria: A 10-Year Study Using Data
  from a Lightning Location System.” _J. Geophys. Res._, *110*(D9).
  doi:10.1029/2004JD005332 <https://doi.org/10.1029/2004JD005332>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{C}loud-to-Ground Lightning in {A}ustria: {A} 10-Year Study Using Data from a Lightning Location System},
    author = {{Schulz} and {W} and {Cummins} and {K} and {Diendorfer} and {G} and {Dorninger} and {M}},
    journal = {J. Geophys. Res.},
    volume = {110},
    number = {D9},
    year = {2005},
    publisher = {Wiley Online Library},
    doi = {10.1029/2004JD005332},
  }

To cite the lightning data (observations), please use:

  Schulz, W., Diendorfer, G., Pedeboy, S., Poelman, R. D (2016). “The
  European Lightning Location System EUCLID-Part~1: Performance
  Analysis and Validation.” _Nat. Hazards Earth Syst. Sci._, *16*(2),
  595-605. doi:10.5194/nhess-16-595-2016
  <https://doi.org/10.5194/nhess-16-595-2016>.

A BibTeX entry for LaTeX users is

  @Article{,
    author = {{Schulz} and {W.} and {Diendorfer} and {G.} and {Pedeboy} and {S.} and {Poelman} and D. R.},
    title = {The {E}uropean Lightning Location System {EUCLID}---Part~1: {P}erformance Analysis and Validation},
    journal = {Nat. Hazards Earth Syst. Sci.},
    volume = {16},
    year = {2016},
    number = {2},
    pages = {595--605},
    doi = {10.5194/nhess-16-595-2016},
  }