diff --git a/docs/api/models/author.md b/docs/api/models/author.md
new file mode 100644
index 0000000..f1973d1
--- /dev/null
+++ b/docs/api/models/author.md
@@ -0,0 +1,8 @@
+```eval_rst
+Author Models
+=============
+
+.. automodule:: paperswithcode.models.author
+    :members:
+    :no-undoc-members:
+```
diff --git a/docs/api/models/index.md b/docs/api/models/index.md
index d525f0b..66a64d2 100644
--- a/docs/api/models/index.md
+++ b/docs/api/models/index.md
@@ -5,10 +5,12 @@
    :maxdepth: 3
 
    paper.md
+   repository.md
+   paper_repo.md
+   author.md
    conference.md
    task.md
    dataset.md
    method.md
-   repository.md
    evaluation.md
 ```
\ No newline at end of file
diff --git a/docs/api/models/paper_repo.md b/docs/api/models/paper_repo.md
new file mode 100644
index 0000000..2b404f7
--- /dev/null
+++ b/docs/api/models/paper_repo.md
@@ -0,0 +1,8 @@
+```eval_rst
+Paper Repository Models
+=======================
+
+.. automodule:: paperswithcode.models.paper_repo
+    :members:
+    :no-undoc-members:
+```
diff --git a/paperswithcode/models/paper.py b/paperswithcode/models/paper.py
index d758859..eb4dc52 100644
--- a/paperswithcode/models/paper.py
+++ b/paperswithcode/models/paper.py
@@ -18,7 +18,7 @@ class Paper(TeaClientModel):
         title (str): Paper title.
         abstract (str): Paper abstract.
         authors (List[str]): List of paper authors.
-        published (date): Paper publication date.
+        published (date, optional): Paper publication date.
         conference (str, optional): ID of the conference in which the paper was
             published.
         conference_url_abs (str, optional): URL to the conference paper page.
@@ -35,7 +35,7 @@ class Paper(TeaClientModel):
     title: str
     abstract: str
     authors: List[str]
-    published: date
+    published: Optional[date]
     conference: Optional[str]
     conference_url_abs: Optional[str]
     conference_url_pdf: Optional[str]
diff --git a/paperswithcode/version.py b/paperswithcode/version.py
index a78ed20..73a9879 100644
--- a/paperswithcode/version.py
+++ b/paperswithcode/version.py
@@ -16,5 +16,5 @@ def __repr__(self):
         )
 
 
-version = Version(0, 3, 0)
+version = Version(0, 3, 1)
 __version__ = str(version)