What year was 'lpopt: A Rule Optimization Tool for Answer Set Programming' published?
The paper 'lpopt: A Rule Optimization Tool for Answer Set Programming' was published in which year?
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/journals/fuin/BichlerMW20> <https://dblp.org/rdf/schema#yearOfPublication> ?answer }
<https://dblp.org/rec/journals/fuin/BichlerMW20>