Research methods for tribological properties of restorative and preventive coatings in different lubricating media at sliding friction / aut. Mitko Nikolov, Plamen Kangalov .
In: Acta technologica agriculturae. -- ISSN 1335-2555. -- Vol. 17, iss. 3 (2014), s. 70-74
https://doi.org/10.2478/ata-2014-0016 .