@classmethod
def equals(cls, this, that):
    """
        Compares a reference to an enum and returns whether it is the second
        passed enum or not
        :param this: The study object to be compared
        :type this: object
        :param that: What we are comparing against
        :type that: object
        :return: Whether they are one and the same
        :rtype: boolean
        """
    return cls.get(this) is cls.get(that)
