问如何检索所有复选框？

EN

<div>
  <mat-checkbox formControlName="authors" class="authors-checkboxes" *ngFor="let author of authors" [value]=author.id>{{ author.name }}</mat-checkbox>
</div>

this.form = new FormGroup({
  id: new FormControl(article.id),
  timestamp: new FormControl(article.timestamp),
  title: new FormControl(article.title),
  chapo: new FormControl(article.chapo),
  body: new FormControl(article.body),
  bodyStyle: new FormControl(article.bodyStyle),
  author: new FormControl(article.author),
  authors: new FormControl(article.authors),
  authors2: new FormControl(article.authors2),
  date: new FormControl(article.date),
  readingTime: new FormControl(article.readingTime),
  pictures: new FormControl(),
  status: new FormControl(),
  mainPicture: new FormControl(article.mainPicture),
  mainPictureFile: new FormControl(article.mainPictureFile),
  position: new FormControl(article.position)
});

const authorsCheckboxes = document.getElementsByClassName("authors-checkboxes");
console.log(authorsCheckboxes);
Array.prototype.forEach.call(authorsCheckboxes, function(authorCheckbox) {
  console.log(authorCheckbox);
  console.log(authorCheckbox.value);
});