Kadirogullari, Pinar, et al. “The Effect of Pethidine Analgesia on Labor Duration and Maternal-Fetal Outcomes: Pethidine and Labor Duration”. Acta Biomedica Atenei Parmensis, vol. 92, no. 2, May 2021, p. e2021065, https://doi.org/10.23750/abm.v92i2.10905.