sentences:  In 2013, Aletta and Peter Stas (with two other contributors) wrote a book "Live your passion – Building a watch manufacture", about their passion for watchmaking and the history of Frederique Constant.In May 2016, Citizen Holdings (which also owns Bulova) announced its intention to acquire Frederique Constant Holding SA, which included Union Horlogère Holding B.V., which in turn included Frederique Constant SA, Alpina Watches International SA, and Ateliers deMonaco SA.Frederique Constant operates a manufacture in Plan-les-Ouates measuring 3200 square metres, divided over four floors, with sectors for movement component production, movement assembly, watch assembly, and quality control.