@article{WetzelPryssBaumeisteretal.2021,
  author    = {Britta Wetzel and R{\"u}diger Pryss and Harald Baumeister and Johanna-Sophie Edler and Ana Sofia Oliveira Gon{\c{c}}alves and Caroline Cohrdes},
  title     = {"How come you don't call me?" Smartphone communication app usage as an indicator of loneliness and social well-being across the adult lifespan during the COVID-19 pandemic},
  journal   = {International Journal of Environmental Research and Public Health},
  volume    = {18},
  number    = {12},
  doi       = {10.3390/ijerph18126212},
  year      = {2021},
}