@article{hardy:1912:nvs,
    author = {Hardy, G. H.},
     title = {Note on {D}r. {V}acca's series for $\gamma$},
   journal = {Quart. J. Math.},
    volume = {43},
      year = {1912},
     pages = {215–216},
     zblno = {43.0530.02}}