Siswanto Siswanto, - and Mirna Mirna, - and Heryanto Heryanto, - and Sri Astuti Thamrin, - Geometric anisotropic Semi-variogram analysis of ozone levels in Daerah Istimewa Yogyakarta, Indonesia. Phys. Scr. 99 (2024) 045022 S Siswanto et al.