In the Admin how do I display the target data instead of the m2m intermediary data

Consider a bunch of substances and a bunch of papers written by various
researchers. Some of the papers apply to more than one substance and a
substance can have multiple papers. Here are the models ...

class Paper_Substance(models.Model):
paper = models.ForeignKey('Paper', null=True, blank=True)
substance = models.ForeignKey('Substance', null=True, blank=True)
reference = models.CharField(max_length=8, null=True, blank=True)
...

class Paper(models.Model):
papers = models.ManyToManyField('Substance', through='Paper_Substance')
...
title = models.CharField(max_length=200)
url = models.URLField(null=True, blank=True)
...

In the Admin I want to add none, one or more Papers to any Substance. I
can do this but I can only see the the content of Paper_Substance
records instead of Paper records. In particular I want to display the
URL of the paper. This is the admin snippet ...

class PapersInline(admin.StackedInline):
model = Paper.papers.through
fk_name = 'substance'

Is this possible?

Thanks heaps

Mike

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