diff --git a/apps/resm/tasks.py b/apps/resm/tasks.py
index cf0ecdf..06cdefb 100644
--- a/apps/resm/tasks.py
+++ b/apps/resm/tasks.py
@@ -403,9 +403,9 @@ def download_pdf(paper_id):
         if paper.has_fulltext_pdf is False and paper.publication_year <= 2021:
             current_from = "scihub"
             msg = save_pdf_from_scihub(paper)
-        if paper.has_fulltext_pdf is False and cache.get("openalex_api_exceed") is None:
-            current_from = "openalex"
-            msg = save_pdf_from_openalex(paper)
+        # if paper.has_fulltext_pdf is False and cache.get("openalex_api_exceed") is None:
+        #     current_from = "openalex"
+        #     msg = save_pdf_from_openalex(paper)
         if paper.fail_reason is None and paper.has_fulltext_pdf is False:
             paper.save_fail_reason(msg)
         return msg, current_from
diff --git a/apps/resm/views.py b/apps/resm/views.py
index fde4e9e..51ec7ef 100644
--- a/apps/resm/views.py
+++ b/apps/resm/views.py
@@ -10,7 +10,7 @@ class PaperViewSet(CustomGenericViewSet, CustomListModelMixin):
     queryset = Paper.objects.all()
     serializer_class = PaperListSerializer
     filterset_fields = ["publication_year", "type", "fetch_status",
-                        "has_abstract", "has_fulltext"]
+                        "has_abstract", "has_fulltext", "doi"]
     search_fields = ['title', 'first_author', 'first_author_institution']
     ordering = ["-publication_date", "-create_time"]