Barthelmes, F. (2009). Definition of functionals of the geopotential and their calculation from spherical harmonic models: Theory and formulas used by the calculation service of the International Centre for Global Earth Models (ICGEM) ; http://icgem.gfz-potsdam.de. GFZ, Helmholtz-Zentrum. https://doi.org/10.2312/GFZ.b103-09026
Chicago Style (17th ed.) CitationBarthelmes, Franz. Definition of Functionals of the Geopotential and Their Calculation from Spherical Harmonic Models: Theory and Formulas Used by the Calculation Service of the International Centre for Global Earth Models (ICGEM) ; Http://icgem.gfz-potsdam.de. Potsdam: GFZ, Helmholtz-Zentrum, 2009. https://doi.org/10.2312/GFZ.b103-09026.
MLA (9th ed.) CitationBarthelmes, Franz. Definition of Functionals of the Geopotential and Their Calculation from Spherical Harmonic Models: Theory and Formulas Used by the Calculation Service of the International Centre for Global Earth Models (ICGEM) ; Http://icgem.gfz-potsdam.de. GFZ, Helmholtz-Zentrum, 2009. https://doi.org/10.2312/GFZ.b103-09026.