https://openlibrary.org/works/OL3524054W/Incidence_of_Excessive_Impacted_Cerumen_in_Individuals_with_Mental_Retardation?edition=
Incidence of Excessive/Impacted Cerumen in Individuals with Mental Retardation by Carl C. Crandell, unknown edition,
mental retardationincidenceexcessiveimpactedcerumen