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"F77." (n.d.). Fullformexpand.com. Retrieved February 19, 2026, from https://www.fullformexpand.com/f77/fortran-77-language-source-code-file.
F77. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/f77/fortran-77-language-source-code-file (Accessed: 19 February 2026).