input] Add example of using mat-error with parent formgroup validation · Issue #8513 · angular/components · GitHub
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mat-error *ngIf, custom validator, and FormGroup do not work together · Issue #10956 · angular/material · GitHub
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Strange mat-error & state behaviour on Custom ControlValueAccessor component · Issue #7920 · angular/components · GitHub
angular2 forms - Angular Material 2: Fix for Multiline Error messages - Stack Overflow
Strange mat-error & state behaviour on Custom ControlValueAccessor component · Issue #7920 · angular/components · GitHub
Angular: Custom Async Validators. Angular has a very robust library for… | by Jon Rinciari | Medium
angular - Display custom validator error with mat-error - Stack Overflow
