Mention the number of authors of the paper 'Supervised and semi-supervised infant-directed speech classification for parent-infant interaction analysis'.
How many authors does the publication 'Supervised and semi-supervised infant-directed speech classification for parent-infant interaction analysis' have?
SELECT ?answer WHERE { <https://dblp.org/rec/journals/speech/MahdhaouiC11> <https://dblp.org/rdf/schema#numberOfCreators> ?answer }
<https://dblp.org/rec/journals/speech/MahdhaouiC11>