public function getGroupsChunk($options = array(), $reverse = false)
    {
        $data = $this->__preparedRequest('group_list', 'GET', $options);
        $groups_raw = (array)$data->results;
        $resultArr = array();
        foreach ($groups_raw as $group_raw) {
            $resultArr[] = new Group($group_raw->id, $this);
        }
        return $this->__preparePagedParams($data, $reverse, $resultArr);
    }