VALENTIKA, Nina. MODIFIKASI MODEL KONTEMPORER DAN KAUSALITAS ANTARA VOLUME PERDAGANGAN, BID-ASK SPREAD, RETURN SAHAM DAN VOLATILITAS RETURN (STUDI KASUS: INDEKS LQ-45). STATMAT: Jurnal Statistika dan Matematika, [S. l.], v. 1, n. 1, p. 1–9, 2019. DOI: 10.32493/sm.v1i1.2369. Disponível em: https://openjournal.unpam.ac.id/index.php/sm/article/view/2369. Acesso em: 9 jan. 2026.