/**
 * RIS Format Exporter for PubMed Data
 * Converts PubMed metadata to compact RIS format for EndNote/Zotero/Mendeley import
 */
export interface RISPaper {
    pmid: string;
    title: string;
    journal: string;
    year: string;
    authors: string[];
    doi?: string | null;
}
export declare function convertToRis(paper: RISPaper): string;
export declare function exportMultipleToRis(papers: RISPaper[]): string;
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