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+*DECK KINB05
+      SUBROUTINE KINB05(SGD,IELEM,NBLOS,LL4,NBMIX,SIDE,MAT,IPERT,
+     1 KN,F2,F3)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Multiplication of a matrix by a vector in Thomas-Raviart-Schneider
+* (dual) finite element diffusion approximation (hexagonal geometry).
+* Special version for Bivac.
+*
+*Copyright:
+* Copyright (C) 2010 Ecole Polytechnique de Montreal
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation; either
+* version 2.1 of the License, or (at your option) any later version
+*
+*Author(s): A. Hebert
+*
+* SGD     mixture-ordered cross sections.
+* IELEM   degree of the Lagrangian finite elements: =1 (linear);
+*         =2 (parabolic); =3 (cubic); =4 (quartic).
+* NBLOS   number of lozenges per direction, taking into account
+*         mesh-splitting.
+* LL4     number of unknowns per group in Bivac.
+* NBMIX   number of macro-mixtures.
+* SIDE    side of the hexagons.
+* MAT     mixture index per region.
+* IPERT   mixture permutation index.
+* KN      element-ordered unknown list.
+* F2      vector to multiply.
+*
+*Parameters: output
+* F3      result of the multiplication.
+*
+*-----------------------------------------------------------------------
+*
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER IELEM,NBLOS,LL4,NBMIX,MAT(3,NBLOS),IPERT(NBLOS),
+     1 KN(NBLOS,4+6*IELEM*(IELEM+1))
+      REAL SGD(NBMIX),SIDE,F2(LL4),F3(LL4)
+*----
+*  ASSEMBLY OF A SYSTEM MATRIX.
+*----
+      TTTT=0.5*SQRT(3.0)*SIDE*SIDE
+      NUM=0
+      DO 20 KEL=1,NBLOS
+      IF(IPERT(KEL).EQ.0) GO TO 20
+      NUM=NUM+1
+      IBM=MAT(1,IPERT(KEL))
+      IF(IBM.EQ.0) GO TO 20
+      SIG=SGD(IBM)
+      DO 15 K2=0,IELEM-1
+      DO 10 K1=0,IELEM-1
+      JND1=KN(NUM,1)+K2*IELEM+K1
+      JND2=KN(NUM,2)+K2*IELEM+K1
+      JND3=KN(NUM,3)+K2*IELEM+K1
+      F3(JND1)=F3(JND1)+TTTT*SIG*F2(JND1)
+      F3(JND2)=F3(JND2)+TTTT*SIG*F2(JND2)
+      F3(JND3)=F3(JND3)+TTTT*SIG*F2(JND3)
+   10 CONTINUE
+   15 CONTINUE
+   20 CONTINUE
+      RETURN
+      END