@article{decarvalho2017,
  title = {Real-Time Nowcasting the {{US}} Output Gap: {{Singular}} Spectrum Analysis at Work},
  journal = {International Journal of Forecasting},
  author = {{de Carvalho}, Miguel and Rua, Ant{\'o}nio},
  year = {2017},
  pages = {185--198},
  volume = {33}
}