In Chomsky's (1981) version of Binding Theory: a is accessible to i if and only if i is c-commanded by a and coindexing of a and i would not violate the i-within-i condition.
Also: condition on bound variable pronouns proposed in Higginbotham (1980) which accounts for weak crossover and strong crossover.
Utrecht Lexicon of Linguistics
- Chomsky, Noam A. 1981. Lectures on Government and Binding. Dordrecht:Foris.
- Higginbotham J. 1980. Pronouns and Bound Variables. Linguistic Inquiry, 679-708.