The following file provides a summary of a study on requirements-related practices and perspectives in industry: https://drive.google.com/open?id=1sr_aZC80nXcaMWEQx6xAru_zvGv8ZkuX
Results on quality requirements were published at the SEKE 2011 conference: https://www.researchgate.net/profile/Richard_Berntsson_Svensson/publication/228447650_An_Empirical_Study_on_the_Importance_of_Quality_Requirements_in_Industry/links/0c960525f8d3f7fa22000000.pdf
The research work was conducted by Jose Luis de la Vara, Krzysztof Wnuk, Richard Berntsson Svensson, Juan Sánchez, and Björn Regnell.