<?php foreach (get_coauthors() as $author ): ?>
    <span class="publication__author" itemprop="author" itemscope itemtype="https://schema.org/Person">
        <?php echo $author->display_name; ?>
        <meta itemprop="name" content="<?php echo htmlspecialchars($author->display_name); ?>" />
        <link itemprop="url"  href="<?php echo get_author_posts_url( $author->ID, $author->user_nicename ); ?>" />
    </span>
<?php endforeach; ?>