National

Social security of self-employed persons

(http://esv-sva.sozvers.at/esvapps/page/page.jsp?p_pageid=214&p_menuid=63289&p_id=5)

Austrian Social Insurance for Farmers

(http://www.svb.at/esvapps/page/page.jsp?p_pageid=127&p_menuid=52344&p_id=5)