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Installing GFortran — Fortran Programming Language
GNU Fortran - GNU Project
GFortran - GCC Wiki - GCC, the GNU Compiler Collection
Top (The GNU Fortran Compiler)
GNU Fortran - Wikipedia
GFortran in Fortran Wiki
Compilers — Fortran Programming Language
Hello world — Fortran Programming Language
Top (The GNU Fortran Compiler)
gfortran(1) - Linux manual page - man7.org