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+*DECK KINB02
+      SUBROUTINE KINB02(SGD,IELEM,NREG,LL4,NBMIX,MAT,KN,VOL,F2,F3)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Multiplication of a matrix by a vector in mixed-dual finite element
+* diffusion approximation (Cartesian 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
+*
+*Parameters: input
+* SGD     mixture-ordered cross sections.
+* IELEM   degree of the Lagrangian finite elements: =1 (linear);
+*         =2 (parabolic); =3 (cubic); =4 (quartic).
+* NREG    number of elements in Bivac.
+* LL4     number of unknowns per group in Bivac.
+* NBMIX   number of macro-mixtures.
+* MAT     mixture index per region.
+* KN      element-ordered unknown list.
+* VOL     volume of regions.
+* F2      vector to multiply.
+*
+*Parameters: output
+* F3      result of the multiplication.
+*
+*-----------------------------------------------------------------------
+*
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER IELEM,NREG,LL4,NBMIX,MAT(NREG),KN(5*NREG)
+      REAL SGD(NBMIX),VOL(NREG),F2(LL4),F3(LL4)
+*
+      NUM1=0
+      DO 30 K=1,NREG
+      L=MAT(K)
+      IF(L.EQ.0) GO TO 30
+      VOL0=VOL(K)
+      IF(VOL0.EQ.0.0) GO TO 20
+      DO 15 I0=1,IELEM
+      DO 10 J0=1,IELEM
+      JND1=KN(NUM1+1)+(I0-1)*IELEM+J0-1
+      F3(JND1)=F3(JND1)+VOL0*SGD(L)*F2(JND1)
+   10 CONTINUE
+   15 CONTINUE
+   20 NUM1=NUM1+5
+   30 CONTINUE
+      RETURN
+      END