De La Salle University, Manila, Philippines published a paper on Text readability in what year?
Mention the year in which De La Salle University published a paper on Text readability.
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/conf/ialp/ImperialO20> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> 'De La Salle University, Manila, Philippines' . <https://dblp.org/rec/conf/ialp/ImperialO20> <https://dblp.org/rdf/schema#yearOfPublication> ?answer }
<https://dblp.org/rec/conf/ialp/ImperialO20>