SIHOMBING, Christoffel; HARAHAP, Adi Guanawan; SINAGA, Albert Samuel. Pemantauan Kualitas Udara di Kota Medan Menggunakan Peta Kendali Multivariat T² Hotelling. Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika, [S. l.], v. 8, n. 2, p. 849–857, 2025. DOI: 10.30605/proximal.v8i2.6164. Disponível em: https://e-journal.my.id/proximal/article/view/6164. Acesso em: 23 jul. 2025.