Ter-Saakova, I. . “Analysis of the Influence of Product Reliability on the Cost Structure of the Manufacturer Performing Warranty Repair of the Released Products”. Zeszyty Naukowe UPH Seria Administracja I Zarządzanie, vol. 37, no. 110, Aug. 2019, pp. 113-24, https://czasopisma.uph.edu.pl/znadministracja/article/view/574.