Which one was published first, 'President's letter to the ACM membership: involvement' or 'North Pole Adventures'?
Between 'President's letter to the ACM membership: involvement' and 'North Pole Adventures', which paper was published earlier?
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/journals/cacm/Galler68c> <https://dblp.org/rdf/schema#yearOfPublication> ?x . <https://dblp.org/rec/journals/tkl/Boytchev02> <https://dblp.org/rdf/schema#yearOfPublication> ?y . BIND(IF(?x < ?y, <https://dblp.org/rec/journals/cacm/Galler68c>, <https://dblp.org/rec/journals/tkl/Boytchev02>) AS ?answer) }
<https://dblp.org/rec/journals/cacm/Galler68c> <https://dblp.org/rec/journals/tkl/Boytchev02>