APA

Fletcher R., . (1972). FORTRAN subroutine for minimization by the method of conjugate gradients. Harwell, Berkshire: Atomic Energy Research Establishment. Report nr AERE R 7073.

Chicago

Fletcher R, . 1972. FORTRAN subroutine for minimization by the method of conjugate gradients. Harwell, Berkshire: Atomic Energy Research Establishment. Report nr AERE R 7073.

Harvard

Fletcher R., . (1972). FORTRAN subroutine for minimization by the method of conjugate gradients. Harwell, Berkshire: Atomic Energy Research Establishment. Report nr AERE R 7073.

MLA

Fletcher R, . FORTRAN subroutine for minimization by the method of conjugate gradients. Harwell, Berkshire: Atomic Energy Research Establishment. Report nr AERE R 7073. 1972.