Self-reference (recursive) ManyToOne/OneToMany relationships available?

This is what I meant by self-reference.

```
class Employee(models.model):
    manager = models.ForeignKey('Employee')
```

This is how Django implements recursive relationships.

> To create a recursive relationship – an object that has a many-to-one relationship with itself – use models.ForeignKey('self', on_delete=models.CASCADE).  

Is this available to use?  

any example is appreciated.
