We, the Editors and Publishers of Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, have retracted this article:
Yashvir Singh, Rajnish Garg & Suresh Kumar (2019) Effect of sliding speed and temperature on the tribological behavior of pongamia oil-based blended lubricant, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 41:4, 468-480, DOI: 10.1080/15567036.2018.1520330
An investigation was conducted, and the entirety of Figure 10 was found to be published as Figure 6 in another article. What the figures are said to represent varies by article and the authors have not been able to provide the original images. Thus, the conclusions of the present article cannot be verified.
The other article is:
Surana et al. (2020) Development of mahua oil as lubricant additive and its tribological characteristics, Materials Today: PROCEEDINGS; 25:4, DOI: 10.1016/j.matpr.2019.08.191
The authors do not agree with the retraction.
We have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines on retractions. The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as “Retracted”.