1: <?php
 2: 
 3: namespace Scopus\Response;
 4: 
 5: class Bibrecord
 6: {
 7:     /** @var array */
 8:     protected $data;
 9:     
10:     /** @var BibrecordHead */
11:     protected $head;
12: 
13:     public function __construct(array $data)
14:     {
15:         $this->data = $data;
16:     }
17: 
18:     public function getHead()
19:     {
20:         return $this->head ?: $this->head = new BibrecordHead($this->data['head']);
21:     }
22: }