| Two liquids of different densities completely fill a narrow space between two sheets of transparent plastic | , Infinitesimal etendue and Simultaneous Multiple Surface SMS concentrators for fixed receiver troughs, Solar Energy 97 2013 493—504• ,, Nonimaging Optics, Academic Press, 2004• |
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| Parabolic shape formed by a liquid surface under rotation | , New second-stage concentrators XX SMS for parabolic primaries; Comparison with conventional parabolic trough concentrators, Solar Energy 92 2013 98—105• The whole assembly is rotating around a vertical axis passing through the centre |