Please provide the subject of series of Austria.
subject refers to topic; Austria refers to shortname = 'Austria'
SELECT DISTINCT T3.Topic FROM CountryNotes AS T1 INNER JOIN Country AS T2 ON T1.Countrycode = T2.CountryCode INNER JOIN Series AS T3 ON T1.Seriescode = T3.SeriesCode WHERE T2.ShortName = 'Austria'