Huda, nurainul and Imroah, N. (2021) “Analysis of the Changes in 2019-nCov Before and After the Implementation of the "Required Swab PCR-Test for Entry into West Kalimantan via Air Transport" Policy”, Tensor: Pure and Applied Mathematics Journal, 2(1), pp. 33-44. doi: 10.30598/tensorvol2iss1pp33-44.