old_contents: from django.conf.urls import url
  
  from . import views
  
  urlpatterns = [
      url(r'^$', views.PreprintList.as_view(), name=views.PreprintList.view_name),
      url(r'^(?P<node_id>\w+)/$', views.PreprintDetail.as_view(), name=views.PreprintDetail.view_name),
      url(r'^(?P<node_id>\w+)/contributors/$', views.PreprintContributorsList.as_view(), name=views.PreprintContributorsList.view_name),
      url(r'^(?P<node_id>\w+)/relationships/preprint_provider/$', views.PreprintToPreprintProviderRelationship.as_view(), name=views.PreprintToPreprintProviderRelationship.view_name),
  ]
  
new_contents: from django.conf.urls import url
  
  from . import views
  
  urlpatterns = [
      url(r'^$', views.PreprintList.as_view(), name=views.PreprintList.view_name),
      url(r'^(?P<node_id>\w+)/$', views.PreprintDetail.as_view(), name=views.PreprintDetail.view_name),
      url(r'^(?P<node_id>\w+)/contributors/$', views.PreprintContributorsList.as_view(), name=views.PreprintContributorsList.view_name),
      url(r'^(?P<node_id>\w+)/relationships/preprint_providers/$', views.PreprintToPreprintProviderRelationship.as_view(), name=views.PreprintToPreprintProviderRelationship.view_name),
      url(r'^(?P<node_id>\w+)/preprint_providers/$', views.PreprintPreprintProvidersList.as_view(), name=views.PreprintPreprintProvidersList.view_name),
  ]
  
subject: Add preprint_providers list to preprints urls