# Explode the space delimited list string into an array of tokens
$references = preg_split( '/\s+/', "{$referenceString}", -1, PREG_SPLIT_NO_EMPTY );
# Explode the space delimited list string into an array of tokens
$references = preg_split( '/\s+/', "{$referenceString}", -1, PREG_SPLIT_NO_EMPTY );