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- [2] The variations of the average heliographic latitude of solar spots COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES, 1916, 162 : 501 - 504
- [3] ON THE DEPENDENCE OF THE SYSTEMATIC DRIFT OF SUNSPOTS IN HELIOGRAPHIC LATITUDE ON PHASE IN THE 22-YEAR CYCLE OF THE SUN ZEITSCHRIFT FUR ASTROPHYSIK, 1952, 30 (04): : 261 - 274
- [9] The Heliographic Latitude of the Sunspot of 1676 June OBSERVATORY, 2016, 136 (1255): : 292 - 294