A clarification is provided regarding the origins of the piston ring conformability bounds presented by V. Dunaevsky in a 1990 issue of a Tribology Transaction [1]. The bounds stem from their earlier versions [2] and [3], which were developed by the authors using a semi-empirical approach that was initiated as an alternative to the purely theoretical bounds [4] and [5] of late 1960s – early 1970s, which were constructed on the basis of the presentation of the discontinuous piston rings by a splitless model.

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