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diff --git a/lj_matrix/parallel_create_matrices.py b/lj_matrix/parallel_create_matrices.py
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+++ b/lj_matrix/parallel_create_matrices.py
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+"""MIT License
+
+Copyright (c) 2019 David Luevano Alvarado
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+"""
+from multiprocessing import Process, Pipe
+from lj_matrix.c_matrix import c_matrix_multiple
+from lj_matrix.lj_matrix import lj_matrix_multiple
+
+
+def parallel_create_matrices(mol_data,
+                             nc_data,
+                             ljm_diag_value=None,
+                             ljm_sigma=1.0,
+                             ljm_epsilon=1.0,
+                             max_len=25,
+                             as_eig=True,
+                             bohr_radius_units=False):
+    """
+    Creates the Coulomb and L-J matrices in parallel.
+    mol_data: molecule data, matrix of atom coordinates.
+    nc_data: nuclear charge data, array of atom data.
+    ljm_diag_value: if special diagonal value is to be used for lj matrix.
+    ljm_sigma: sigma value for lj matrix.
+    ljm_epsilon: psilon value for lj matrix.
+    max_len: maximum amount of atoms in molecule.
+    as_eig: if data should be returned as matrix or array of eigenvalues.
+    bohr_radius_units: if units should be in bohr's radius units.
+    """
+
+    # Matrices calculation.
+    procs = []
+    pipes = []
+
+    cm_recv, cm_send = Pipe(False)
+    p1 = Process(target=c_matrix_multiple,
+                 args=(mol_data,
+                       nc_data,
+                       cm_send,
+                       max_len,
+                       as_eig,
+                       bohr_radius_units))
+    procs.append(p1)
+    pipes.append(cm_recv)
+    p1.start()
+
+    ljm_recv, ljm_send = Pipe(False)
+    p2 = Process(target=lj_matrix_multiple,
+                 args=(mol_data,
+                       nc_data,
+                       ljm_send,
+                       ljm_diag_value,
+                       ljm_sigma,
+                       ljm_epsilon,
+                       max_len,
+                       as_eig,
+                       bohr_radius_units))
+    procs.append(p2)
+    pipes.append(ljm_recv)
+    p2.start()
+
+    cm_data = pipes[0].recv()
+    ljm_data = pipes[1].recv()
+
+    for proc in procs:
+        proc.join()
+
+    return cm_data, ljm_data