Rulment (Romanian Wikipedia)

A. Martens, Schmieröluntersuchungen (Investigations on oils) Part I: Mitteilungen aus den Königlichen technischen Versuchsanstalten zu Berlin, Ergänzungsheft III 1888, p. 1-37, Verlag von Julius Springer, Berlin and Part II: Mitteilungen aus den Königlichen technischen Versuchsanstalten zu Berlin, Ergänzungsheft V, 1889, p. 1-57, Verlag von Julius Springer, Berlin, (Note: These files can be downloaded from the website of BAM: http://www.bam.de/de/ueber_uns/geschichte/adolf_martens.htm Arhivat în 25 februarie 2012, la Wayback Machine.)

books.google.com (Global: 3^rd place; Romanian: 6^th place)

American Society of Mechanical Engineers (1906), Transactions of the American Society of Mechanical Engineers, 27, American Society of Mechanical Engineers, p. 441.
Guran, Ardéshir; Rand, Richard H. (1997), Nonlinear dynamics, World Scientific, p. 178, ISBN 978-981-02-2982-5.
Steve Skinner (19 iulie 2014), Hydraulic Fluid Power - A Historical Timeline (în engleză), Lulu.com, p. 10
Graham T. Smith (6 aprilie 2016), Machine Tool Metrology: An Industrial Handbook (în engleză), Springer, p. 127
White, John H. (1985) [1978]. The American Railroad Passenger Car [Vagonul american de călători] (în engleză). 2. Baltimore, Maryland: Johns Hopkins University Press. p. 518. ISBN 978-0-8018-2747-1.
Steam Power Plant Engineering, by George Frederick Gebhardt, published by J. Wiley & sons, Incorporated, 1917, p 791 Google Books scanned ref
The gasoline automobile, George William Hobbs b. 1887, Ben George Elliott, Earl Lester Consoliver, University of Wisconsin. University Extension Division, McGraw-Hill Book Company, Inc., 1919 - 483 pages, pp 111-114 Google Books scanned ref
Pressure Lubricating Characteristics, by Paul Dumas, Motor age, Volume 42, Class Journal Co., 14 Sep 1922 Google Books scanned ref

Merriam-Webster, „headwords "bearing" and "bear"”, Merriam-Webster's Collegiate Dictionary, online subscription version

Purtell, John (1999/2001). Project Diana, chapter 10: http://nemiship.multiservers.com/nemi.htm Arhivat în 1 iulie 2010, la Wayback Machine.

Purtell, John (1999/2001). Project Diana, chapter 10: http://nemiship.multiservers.com/nemi.htm Arhivat în 1 iulie 2010, la Wayback Machine.
A. Martens, Schmieröluntersuchungen (Investigations on oils) Part I: Mitteilungen aus den Königlichen technischen Versuchsanstalten zu Berlin, Ergänzungsheft III 1888, p. 1-37, Verlag von Julius Springer, Berlin and Part II: Mitteilungen aus den Königlichen technischen Versuchsanstalten zu Berlin, Ergänzungsheft V, 1889, p. 1-57, Verlag von Julius Springer, Berlin, (Note: These files can be downloaded from the website of BAM: http://www.bam.de/de/ueber_uns/geschichte/adolf_martens.htm Arhivat în 25 februarie 2012, la Wayback Machine.)