diff --git a/main.tex b/main.tex
index 0c38dd3..fa4bec1 100644
--- a/main.tex
+++ b/main.tex
@@ -95,6 +95,13 @@
     \chapter{Dataset Dynamics}
     \input{chapters/petr_mokrov_s2/main.tex}
 
+    \clearpage
+    \chapter{Spherical harmonics approximation}
+    \input{chapters/tikhonov_s1/main.tex}
+    
+    \clearpage
+    \chapter{Modeling Irregular Small Bodies Gravity Field}
+    \input{chapters/tikhonov_s2/main.tex}
     % Bibliography
     \clearpage
     \printbibliography