2023. IS THE FRIDAY EFFECT A FIRM EFFECT? THE CASE OF CASH-FINANCED ACQUISITION ANNOUNCEMENTS OF UNLISTED FIRMS. EVIDENCE FROM SPAIN. UCJC Business and Society Review (formerly known as Universia Business Review). 20, 77 (Jun. 2023). DOI:https://doi.org/10.3232/UBR.2023.V20.N2.02.