C CRIOTO    SOURCE    CHAT      05/01/12    22:30:34     5004           
C CRIOTO     SOURCE    INSL       24/10/96    
      SUBROUTINE CRIOTO(S1,SEQ,FCRI,NSTRS,TU,AA,BB,DK1,DK2)
C
      IMPLICIT INTEGER(I-N)
      IMPLICIT REAL*8(A-H,O-Z)
      DIMENSION S1(NSTRS)
C
      PI=4.D0*DATAN(1.D0)
      CALL INVA(S1,DJ2,DI1,CO3T,DJ3,NSTRS)
      TT=DK2*CO3T
      IF(CO3T .GE. 0.D0) PP=DACOS(TT)/3.D0
      IF(CO3T .LT. 0.D0) PP=(PI-DACOS(-1.D0*TT))/3.D0
C
      DLA=DK1*DCOS(PP)
      B2=DLA*DSQRT(DJ2)+BB*DI1
      DELT=B2*B2+4.D0*AA*DJ2
      SEQ=(B2+DSQRT(DELT))/2.D0
      IF(DJ2.LT.1.D-20) SEQ = BB*DI1
      IF(DABS(TU).GT.1.D-10) THEN
        FCRI = AA*DJ2/TU/TU+DLA*DSQRT(DJ2)/TU+BB*DI1/TU-1.D0
      ELSE
        FCRI=1.D0
      ENDIF
C---------------------------------------------------------------------
      IECR=0
      IF(IECR.EQ.5) THEN
      WRITE(*,100) DLA,BB,PP,AA,DK1,DK2,DELT,SEQ,FCRI
  100 FORMAT('DLA=',E9.3,1X,'BB=',E9.3,1X,'PP=',E9.3,1X,'AA=',E9.3,1X
     *,'DK1=',E9.3,1X,'DK2=',E9.3,1X,'DELT=',E9.3,1X,'SEQ=',E10.4,1X,
     * 'FCRI=',E10.4,/)
      ENDIF
C---------------------------------------------------------------------
C
      RETURN
      END