&reference.pHash.functions.ph-audio-dist;
 &reference.pHash.functions.ph-audiohash;
 &reference.pHash.functions.ph-compare-text-hashes;
 &reference.pHash.functions.ph-dct-imagehash;
 &reference.pHash.functions.ph-dct-videohash;
 &reference.pHash.functions.ph-image-dist;
 &reference.pHash.functions.ph-texthash;
 &reference.pHash.functions.ph-video-dist;