sentences:  Finkelhor began studying the child abuse problems of child victimization, child maltreatment and family violence in 1977.He is known for his conceptual and empirical work on the problem of child sexual abuse, reflected in publications such as "Sourcebook on Child Sexual Abuse" (Sage, 1986) and "Nursery Crimes" (Sage, 1988).He has also written about child homicide, missing and abducted children, children exposed to domestic and peer violence and other forms of family violence.