diff --git a/docs/sitemap.xml b/docs/sitemap.xml
index 284b153b..f3ada933 100644
--- a/docs/sitemap.xml
+++ b/docs/sitemap.xml
@@ -197,7 +197,7 @@
 
     <url>
       <loc>https://nn.labml.ai/normalization/weight_standardization/experiment.html</loc>
-      <lastmod>2021-07-02T16:30:00+00:00</lastmod>
+      <lastmod>2021-07-03T16:30:00+00:00</lastmod>
       <priority>1.00</priority>
     </url>
     
@@ -218,7 +218,7 @@
 
     <url>
       <loc>https://nn.labml.ai/normalization/instance_norm/experiment.html</loc>
-      <lastmod>2021-07-02T16:30:00+00:00</lastmod>
+      <lastmod>2021-07-03T16:30:00+00:00</lastmod>
       <priority>1.00</priority>
     </url>
     
@@ -267,7 +267,7 @@
 
     <url>
       <loc>https://nn.labml.ai/normalization/batch_norm/cifar10.html</loc>
-      <lastmod>2021-07-02T16:30:00+00:00</lastmod>
+      <lastmod>2021-07-03T16:30:00+00:00</lastmod>
       <priority>1.00</priority>
     </url>
     
@@ -302,14 +302,14 @@
 
     <url>
       <loc>https://nn.labml.ai/experiments/cifar10.html</loc>
-      <lastmod>2021-07-02T16:30:00+00:00</lastmod>
+      <lastmod>2021-07-03T16:30:00+00:00</lastmod>
       <priority>1.00</priority>
     </url>
     
 
     <url>
       <loc>https://nn.labml.ai/experiments/mnist.html</loc>
-      <lastmod>2021-07-01T16:30:00+00:00</lastmod>
+      <lastmod>2021-07-03T16:30:00+00:00</lastmod>
       <priority>1.00</priority>
     </url>
     
@@ -337,7 +337,7 @@
 
     <url>
       <loc>https://nn.labml.ai/index.html</loc>
-      <lastmod>2021-06-21T16:30:00+00:00</lastmod>
+      <lastmod>2021-07-03T16:30:00+00:00</lastmod>
       <priority>1.00</priority>
     </url>
     
diff --git a/papers/distillation.pdf b/papers/distillation.pdf
new file mode 100644
index 00000000..259f18a2
Binary files /dev/null and b/papers/distillation.pdf differ