limit_choice_to all objects of a particular model (using inheritance)

Example

class Base():
pass

class A(Base)
parent=models.Foreignkey("self", limit_choices_to=(all members of the
B class)

class B(Base)
parent=models.Foreignkey("self", limit_choices_to=(all members of the
A class)

What would be the query syntax for limit_choices_to, to get only the
objects of a certain class?)

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