diff --git a/generalized_star_height_four_v2.txt b/generalized_star_height_four_v2.txt
index 138e936..b8c281a 100644
--- a/generalized_star_height_four_v2.txt
+++ b/generalized_star_height_four_v2.txt
@@ -36,14 +36,14 @@ first few levels using transition graphs of deterministic automata.
 Dejean and Schutzenberger proved unbounded ordinary star height over
 a binary alphabet.
 
-./eggan-1963.pdf
-./dejean-schutzenberger-1966.pdf
+./pdf/eggan-1963.pdf
+./pdf/dejean-schutzenberger-1966.pdf
 
 Schutzenberger characterized the languages of ordinary star height
 zero, equivalently the languages of generalized star height zero, as
 those recognized by finite aperiodic monoids.
 
-./schutzenberger-1965.pdf
+./pdf/schutzenberger-1965.pdf
 
 Henneman proved that every language recognized by a finite
 commutative group has generalized star height at most one. Pin,
@@ -52,8 +52,8 @@ groups of class two and established closure properties for the
 star-height strata. Straubing formulated the absolute boundedness
 question and the sharper question whether height one always suffices.
 
-./pst-1992.pdf
-./straubing2002.pdf
+./pdf/pst-1992.pdf
+./pdf/straubing2002.pdf
 
 Reduction. A regular language L is recognized by a finite monoid M
 through a morphism T: Sigma* -> M. The syntactic monoid of L is
@@ -210,7 +210,7 @@ most
 The symmetric Lovasz local lemma (Erdos and Lovasz, 1975) is
 applied next.
 
-./sources/erdos-lovasz-1975.pdf
+./pdf/sources/erdos-lovasz-1975.pdf
 
 Suppose a finite
 family of events has a dependency graph of maximum degree D and each
@@ -427,14 +427,14 @@ roster serves whenever many residues are required. Only the
 elementary root bound over the prime field is used; the coding theory
 that follows from the Reed-Solomon construction plays no role.
 
-./reed-solomon-1960.pdf
+./pdf/reed-solomon-1960.pdf
 
 Local markers. The marker-versus-local-periodicity principle appears
 in Krieger's analysis of subsystems of topological Markov chains,
 with a finite clopen merging formulation in Meyerovitch.
 
-./krieger1982.pdf
-./meyerovitch-2025.pdf
+./pdf/krieger1982.pdf
+./pdf/meyerovitch-2025.pdf
 
 Lemma (local markers). Let d >= 2 and K > 3 d^2 be integers. There is
 a translation-equivariant rule that marks integer positions of any