diff --git a/bachelor-thesis.pdf b/bachelor-thesis.pdf
index 850d018..a19e2e9 100644
Binary files a/bachelor-thesis.pdf and b/bachelor-thesis.pdf differ
diff --git a/ref/refs.bib b/ref/refs.bib
index e751d5e..450b2ef 100644
--- a/ref/refs.bib
+++ b/ref/refs.bib
@@ -373,8 +373,8 @@
   organization = {Aliyun}
 }
 
-@onlin{aliyun_sla,
-  autho = {{Aliyun}},
+@online{aliyun_sla,
+  author = {{Aliyun}},
   title = {阿里云云企业网计费说明},
   year = {2026},
   url = {https://help.aliyun.com/zh/cen/product-overview/billing-rules},