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Topics are research areas automatically assigned to works. Topics exist in a four-level hierarchy: domain > field > subfield > topic.

Filter, sort, and group_by fields

The API supports filtering, sorting, and grouping on topics fields. See Filtering, Sorting, and Grouping for syntax. Fields marked (deprecated) are .search filters — use the search parameter instead.
FieldSortGroup_byFilter
cited_by_count
default.search (deprecated)
description.search (deprecated)
display_name
display_name.search (deprecated)
domain.id
field.id
from_created_date
id
ids.openalex
keywords.search (deprecated)
openalex
subfield.id
works_count