La “Nuit de la Nation” : culture jeune, rock’n’roll et panique morale dans la France des années 1960 by Florence Tamagne

“…The line-up included most French rock’n’roll “idols” of the time. The free concert, which attracted about 150.000 people, was the theatre of many incidents and acts of violence attributed to the “blousons noirs”, an expression that designated young offenders, generally fans of rock’n’roll. …”
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Research on Energy Conversion and Damage Features of Unloading Instability of Sandstone under High Stress by Zhiyuan Hou, Chuanbo Hao, Fukun Xiao, Gang Liu

“…In order to explore the failure characteristics of sandstone under unloading conditions in deep zone with high stress, constant axial pressure and unloading confining pressure tests were conducted on a yellow sandstone sample under different initial confining pressures using the French ROCK600-50 triaxial tester, and the mechanical properties, energy conversion characteristics, and damage evolution law of sandstone failure under unloading conditions were obtained. …”
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