diff --git a/catima.pyx b/catima.pyx
index 3679721..f07df73 100644
--- a/catima.pyx
+++ b/catima.pyx
@@ -449,6 +449,12 @@ def energy_out(Projectile projectile, Material material, energy = None, Config c
         energy = projectile.T()
     return catimac.energy_out(projectile.cbase, energy, material.cbase, config.cbase)
 
+def sezi_dedx_e(Projectile projectile, Target t):
+    return catimac.sezi_dedx_e(projectile.cbase, t.cbase)
+
+def bethek_dedx_e(Projectile projectile, Target t,  Config c = default_config, Ipot=0.0):
+    return catimac.bethek_dedx_e(projectile.cbase, t.cbase,c.cbase,Ipot)
+
 def lindhard(Projectile projectile):
     return catimac.bethek_lindhard(projectile.cbase);
 
diff --git a/catimac.pxd b/catimac.pxd
index 0e2b93f..149bfcf 100644
--- a/catimac.pxd
+++ b/catimac.pxd
@@ -88,6 +88,8 @@ cdef extern from "catima/catima.h" namespace "catima":
 cdef extern from "catima/calculations.h" namespace "catima":
     cdef double bethek_lindhard(const Projectile &p);
     cdef double bethek_lindhard_X(const Projectile &p);
+    cdef double bethek_dedx_e(Projectile &p,const Target &t, const Config &c, double I);
+    cdef double sezi_dedx_e(const Projectile &p, const Target &t);
     cdef double z_effective(const Projectile &p, const  Target &t, const  Config &c);
     cdef double z_eff_Pierce_Blann(double z, double beta);
     cdef double z_eff_Anthony_Landford(double pz, double beta, double tz);