参考文献
Watkins, Clare J.; Romero-Martin, Maria Rosario; Moore, Kathryn G.; Ritchie, James; Finn, Paul W.; Kalvinsh, Ivars; Loza, Einars; Starchenkov, Igor; Dikovska, Klara; Bokaldere, Rasma; Gailite, Vija; Vorona, Maxim; Andrianov, Victor; Lolya, Daina; Seminkhina, Valentina; Amolins, Andris; Harris, C.John; Duffy, James E. S.
Patent: US2004/92598 A1, 2004 ;