retrieve the country that has published the least papers?
select t1.country from inst as t1 join authorship as t2 on t1.instid = t2.instid join papers as t3 on t2.paperid = t3.paperid group by t1.country order by count ( * ) limit 1
retrieve the country that has published the most papers?
select t1.country from inst as t1 join authorship as t2 on t1.instid = t2.instid join papers as t3 on t2.paperid = t3.paperid group by t1.country order by count ( * ) desc limit 1
What is count of most papers which is USA has published?
select t1.country,count ( * ) from inst as t1 join authorship as t2 on t1.instid = t2.instid join papers as t3 on t2.paperid = t3.paperid where country = "USA"