Putra, D. P. and Ruditho, M. (2022) “THE SOLUTION OF MATHEMATICAL MODEL OF OTOBUS TICKET SALES WITH REFERRAL MARKETING STRATEGY”, BAREKENG: Jurnal Ilmu Matematika dan Terapan, 16(1), pp. 229-234. doi: 10.30598/barekengvol16iss1pp227-232.