diff --git a/src/18_galactic_bimodality.md b/src/18_galactic_bimodality.md
index 163041b..024dc72 100644
--- a/src/18_galactic_bimodality.md
+++ b/src/18_galactic_bimodality.md
@@ -18,9 +18,9 @@ That is why we can say that ***elliptical galaxies*** (here we include elliptica
 
 SIZES AND MASSES. The largest in size are *spiral* galaxies, the largest of them exceeding a diameter of \\(10^{23}\\) cm. The author was unable to find in the literature any mention of spiral galaxies with sizes smaller than \\(10^{22}\\) cm. On the other hand, *all dwarf galaxies are elliptical*, and for them the lower threshold is \\(10^{20}\\) cm.
 
-In addition, according to statistical data¹⁵⁴, the mass range of *spiral* galaxies lies within \\(10^9{-}10^{12}\\) solar masses. For elliptical galaxies, however, this range is strongly shifted towards low masses: \\(10^5{-}10^{12}\\) solar masses. This indicates that *spiral galaxies are on average larger and more massive, while elliptical galaxies are on average smaller and less massive*.
+In addition, according to statistical data [^ref-154], the mass range of *spiral* galaxies lies within \\(10^9{-}10^{12}\\) solar masses. For elliptical galaxies, however, this range is strongly shifted towards low masses: \\(10^5{-}10^{12}\\) solar masses. This indicates that *spiral galaxies are on average larger and more massive, while elliptical galaxies are on average smaller and less massive*.
 
-ENTRY INTO CLUSTERS. Galaxy clusters include about 76% of elliptical galaxies and only less than 50% of spiral galaxies¹⁵⁵.
+ENTRY INTO CLUSTERS. Galaxy clusters include about 76% of elliptical galaxies and only less than 50% of spiral galaxies [^ref-155].
 
 So, we see that the Universe is populated mainly by two types of galaxies. ***Elliptical galaxies*** are older, on average smaller in size, simpler in shape and structure, and they are part of the metagalactic cellular skeleton of clusters. ***Spiral galaxies are*** younger, the largest and most massive, and they are free from the structural skeleton of the Metagalaxy.
 
@@ -29,4 +29,6 @@ It is very important to note that **there is a clear distinction** between these
 Based on these qualitative data, we can **PROPOSE** that *elliptical* galaxies belong ***to the first mode*** of the assumed bimodal size distribution of galaxies, while *spiral galaxies belong* to ***the second mode***. And by analogy with atoms and stars, we can **PROPOSE** that there is a gap in the statistical distribution of galaxies by size between these modes.
 
 [^ref-152]: *Vorontsov-Vel'yaminov B.A.* Essays on the Universe. Moscow: Nauka, 1969.
-[^ref-153]: *Vorontsov-Vel'yaminov B.A.* Essays on the Universe. Moscow: Nauka, 1969. С. 130.
\ No newline at end of file
+[^ref-153]: *Vorontsov-Vel'yaminov B.A.* Essays on the Universe. Moscow: Nauka, 1969. С. 130.
+[^ref-154]: *Vorontsov-Vel'yaminov B.A.* Essays on the Universe. Moscow: Nauka, 1969. С. 114.
+[^ref-155]: *Vorontsov-Vel'yaminov B.A.* Essays on the Universe. Moscow: Nauka, 1969. С. 125.