diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 8adc05e..c7da899 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -8,9 +8,7 @@ repos:
     -   id: check-added-large-files
 -   repo: local
     hooks:
-    -   id: pylint
-        name: pylint
-        entry: pylint
+    -   id: litwiki-tests
+        name: litwiki-tests
+        entry: ./test.sh
         language: system
-        types: [python]
-        require_serial: true
diff --git a/Pipfile b/Pipfile
new file mode 100644
index 0000000..b4be1e2
--- /dev/null
+++ b/Pipfile
@@ -0,0 +1,12 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+orgparse = "*"
+
+[dev-packages]
+
+[requires]
+python_version = "3.11"
diff --git a/Pipfile.lock b/Pipfile.lock
new file mode 100644
index 0000000..c043628
--- /dev/null
+++ b/Pipfile.lock
@@ -0,0 +1,29 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "22f5663e77fd5f550bbb84f958573b3be232bb1211f2944c495839868e6f8553"
+        },
+        "pipfile-spec": 6,
+        "requires": {
+            "python_version": "3.11"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
+        "orgparse": {
+            "hashes": [
+                "sha256:451050e79acb7a51c65dc99b9095eae4d50bd598541354f9e763cb4cbdf59a55",
+                "sha256:f8c8b6c07e8c5a99a27ad3962eedab3aa3844129cbdfd3f2cd32a2197da462fe"
+            ],
+            "index": "pypi",
+            "version": "==0.3.2"
+        }
+    },
+    "develop": {}
+}
diff --git a/litwiki/citation.py b/litwiki/citation.py
new file mode 100644
index 0000000..d3770c6
--- /dev/null
+++ b/litwiki/citation.py
@@ -0,0 +1,36 @@
+import unittest
+from typing import Optional
+import dataclasses
+
+
+@dataclasses.dataclass
+class Citation:
+    volume: int
+    chapter: int
+    line: int
+
+
+def parse(src: str) -> Optional[Citation]:
+    try:
+        volume, chapter, line = src.split(".")
+        volume = int(volume)
+        chapter = int(chapter)
+        line = int(line)
+        if volume <= 0 or chapter <= 0 or line <= 0:
+            raise ValueError(f"Invalid citation point {volume}.{chapter}.{line}")
+        return Citation(volume, chapter, line)
+    except ValueError:
+        return None
+
+
+class TestCitation(unittest.TestCase):
+    def test_parse(self):
+        self.assertEqual(parse("1.2.3"), Citation(1, 2, 3))
+        self.assertEqual(parse("1.2.0"), None)
+        self.assertEqual(parse("(I.2.3)"), None)
+        self.assertEqual(parse("I.5.1"), None)
+        self.assertEqual(parse(""), None)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/test.sh b/test.sh
new file mode 100755
index 0000000..6e1e79f
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+python -m litwiki.citation