<div class="card-header">
  <div class="authors-title">
    <ng-container *ngIf="product.contributors">
      <span class="authors">{{ product.contributors }}</span>
      <span>&nbsp;-&nbsp;</span>
    </ng-container>
    <span class="title">{{ product.name }}</span>
  </div>
  <div class="group">
    <span class="number">{{ product.productGroup }}</span>
    <span>:</span>
    <span class="name">{{ product.productGroupName }}</span>
  </div>
</div>
