diff --git a/singular_free_tangent_sheaf_v2.txt b/singular_free_tangent_sheaf_v2.txt
index 9fa3c43..cf318b2 100644
--- a/singular_free_tangent_sheaf_v2.txt
+++ b/singular_free_tangent_sheaf_v2.txt
@@ -8,7 +8,7 @@ xy - z^p = 0 has tangent sheaf freely generated by x d_x - y d_y and
 d_z, while the local ring at the origin is not regular (Graf, J.
 Algebra 601, 2022, 115-128).
 
-./graf-2201.06646-positive-characteristic.pdf
+./pdf/graf-2201.06646-positive-characteristic.pdf
 
 Over the complex numbers the answer is also negative. There exist a
 finitely generated normal integral complex algebra A of Krull
@@ -31,7 +31,7 @@ locally complete intersections in characteristic zero were covered by
 Kallstrom (J. Algebra 337, 2011, 169-180; corrected version
 arXiv:1003.4241v6, 2018).
 
-./kallstrom-1003.4241-complete-intersections.pdf
+./pdf/kallstrom-1003.4241-complete-intersections.pdf
 
 Extension of holomorphic differential forms gives the conjecture for
 isolated singularities in dimension at least three (van Straten and
@@ -41,9 +41,9 @@ and Peternell (Publ. Math. IHES 114, 2011, 87-169), by Druel (Bull.
 London Math. Soc. 46, 2014, 827-835), and by Graf and Kovacs (Doc.
 Math. 19, 2014, 815-830).
 
-./greb-kebekus-kovacs-peternell-2011-1003.2913-diff-forms-lc.pdf
-./druel-1304.6000-log-canonical-spaces.pdf
-./graf-kovacs-1301.7315-optimal-extension-1forms.pdf
+./pdf/greb-kebekus-kovacs-peternell-2011-1003.2913-diff-forms-lc.pdf
+./pdf/druel-1304.6000-log-canonical-spaces.pdf
+./pdf/graf-kovacs-1301.7315-optimal-extension-1forms.pdf
 
 For normal complex surfaces, the geometric genus together with the
 configuration of the exceptional divisor gives sharp criteria. Graf
@@ -58,9 +58,9 @@ surfaces whose tangent bundle on the smooth locus is trivial and
 whose smooth locus has logarithmic Kodaira dimension at most one (J.
 London Math. Soc. 90, 2014, 270-286).
 
-./graf-1801.05753-low-genus.pdf
-./bergner-graf-2020-lipman-zariski-genus-one-higher.pdf
-./bgk-1403.5613-zariski-lipman-normal-surfaces.pdf
+./pdf/graf-1801.05753-low-genus.pdf
+./pdf/bergner-graf-2020-lipman-zariski-genus-one-higher.pdf
+./pdf/bgk-1403.5613-zariski-lipman-normal-surfaces.pdf
 
 The surface to be constructed lies outside every one of these
 positive results. Its canonical discrepancy is -5, so it is not log
@@ -73,7 +73,7 @@ iterated blowup at the module of derivations resolves a singularity:
 on a variety with free tangent sheaf every such blowup, with or
 without subsequent normalization, is already the identity.
 
-./barajas-chavez-romano-2510.07607-blowup-derivations.pdf
+./pdf/barajas-chavez-romano-2510.07607-blowup-derivations.pdf
 
 An additional intrinsic constraint comes from the bracket of any
 frame. Jorder proved that a normal complex space whose tangent sheaf
@@ -81,7 +81,7 @@ locally admits a basis of pairwise commuting vector fields is smooth
 (Math. Z. 278, 2014, 893-899). Hence no frame for the tangent sheaf
 of the surface below can be made commuting near its singular point.
 
-./jorder-1311.5141-weak-lipman-zariski.pdf
+./pdf/jorder-1311.5141-weak-lipman-zariski.pdf
 
 Conventions. Line bundles on curves are written additively; aL + bH
 denotes the tensor product L^a tensor H^b over O_C. Two-dimensional
@@ -101,8 +101,8 @@ Grauert and Remmert, Coherent Analytic Sheaves, Grundlehren 265
 Geometry (2012), for coherent analytic sheaves and normal complex
 spaces.
 
-./serre-1956-gaga.pdf
-./demailly-2012-complex-analytic-differential-geometry.pdf
+./pdf/serre-1956-gaga.pdf
+./pdf/demailly-2012-complex-analytic-differential-geometry.pdf
 
 The construction begins on the quadric surface Sigma = PP^1 x PP^1
 with ruling line bundles F = O(1,0) and S = O(0,1). Let Gamma be a
@@ -1292,7 +1292,7 @@ zero completion implies that the stalk itself is zero, by Nakayama's
 lemma. Away from x the map pi is an isomorphism, so the same sheaf
 vanishes there. Thus R^1 pi_* E = 0.
 
-./grauert-1960-theorem-garbentheorie.pdf
+./pdf/grauert-1960-theorem-garbentheorie.pdf
 
 The sheaf pi_* E is also coherent. Cartan's theorem B on the Stein
 space X, plus the Leray spectral sequence for pi, gives
@@ -1381,7 +1381,7 @@ curves and rational singularities" (2001; arXiv:math/0109221), and
 Serre, "Un theoreme de dualite", Comment. Math. Helv. 29 (1955),
 9-26.
 
-./flenner-zaidenberg-2001-math0109221-rational-curves-singularities.pdf
+./pdf/flenner-zaidenberg-2001-math0109221-rational-curves-singularities.pdf
 
 By the ordinary determinant formula, the pullback of omega^o is
 
@@ -1433,7 +1433,7 @@ local rings", Publ. Math. IHES 36 (1969), 23-58. The finite-
 determinacy statement is proved below, with fixed estimates and no
 complete-intersection hypothesis.
 
-./artin-1969-algebraic-approximation.pdf
+./pdf/artin-1969-algebraic-approximation.pdf
 
 Put P = C[[x_1, ..., x_e]], n = (x_1, ..., x_e), I = (f_1, ...,
 f_s), R = P / I, where f = (f_1, ..., f_s) in n P^s is a row.