Journal of Official Statistics Special Issue on Time Series Analysis is just out and available here
Two papers are related to JDemetra+ algorithms
Seasonal adjustment of infra-monthly time series with JDemetra+ by Karsten Webel (BBk) and Anna Smyk (Insee)
Improving Real-Time Trend Estimates Using Local Parametrization of Polynomial Regression Filters by Alain quartier-La-Tente (Insee)