[NTG-context] Two questions related with bibliography

Dear all, I have a self-made bst file in the same folder with the main tex file. I cannot figure out how to enable it. I tried \setuppublications[alternative=mybst] and \bibstyle[mybst] Both do not work. How should I do? Another question is how to set the citations in main text to be subscript? BTW, will ConTeXt drop BibTeX one day? Best regards, Wei-Wei