/**
 * Crossref discovery adapter.
 * Implements Works API search and per-DOI metadata resolution.
 * Docs: https://api.crossref.org/swagger-ui/index.html
 */
import type { CandidatePaper } from "../../schemas/index.js";
/**
 * Search Crossref Works API by query string.
 */
export declare function searchCrossref(query: string, limit?: number, yearRange?: {
    start?: number;
    end?: number;
}): Promise<CandidatePaper[]>;
/**
 * Resolve a DOI via Crossref to get publisher, title, and other metadata.
 */
export declare function resolveDoiViaCrossref(doi: string): Promise<CrossrefResolvedDoi | null>;
export interface CrossrefResolvedDoi {
    doi: string;
    title: string | null;
    publisher: string | null;
    publisher_hint: string | null;
    container_title: string | null;
    type: string | null;
    url: string | null;
}
//# sourceMappingURL=crossref.d.ts.map