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ExtralLapis, Muenchen, 60-67p. Meister, C. and Weiss, S., 1999, T¨ırkis Vorkommen und Produktion in China. Ahmed, A., G¨ıbelin, E., Lieber, W. Guanghua Liu Click here for details |
| ExtraLapis English No 4, 48-56p. A promising new entry in the mineral specimen market, in Calcite: the mineral with the most forms, Guanghua Liu, 2003, China Click here for details |
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| ExtraLapis No.26/27 P26-31 Pyromorphit und Mimetesit,die farbigten bleimineralien.China Guanghua Liu und Berthold Ottens ,2004 Click here for details |
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| ExtraLapis No.26/27 P56-59 Die roten sulfid Spektakular und lichtempfindlich.China Guanghua Liu und Berthold Ottens ,2004 Click here for details |
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| ExtraLapis No.26/27 P60-67 Weltberuhmt Antimonit in hocherster Perfection.China Guanghua Liu und Berthold Ottens 2004 Click here for details |
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| ExtraLapis No.26/27 P116-123 Calcit-die schonste Nebensache der Welt.China Guanghua Liu ,2004 Click here for details |
