@base . a , , ; , , ; "Bulletin of the Hong Kong Mathematical Society." ; ; ; "1026-2636" ; ; "1026-2636" ; ; "1026-2636" ; "Bulletin of the Hong Kong Mathematical Society" , "Bulletin of the Hong Kong Mathematical Society." ; . a ; . . a ; "1026-2636" ; . "Netherlands" . a ; ; "20040609181900.0"^^ ; ; . a , ; "Bulletin of the Hong Kong Mathematical Society" . a . a ; "1026-2636" ; .