References can be persistent.Logical formLearned from36 sentences. References can be confidential.Logical formLearned from36 sentences. A reference can be for persons.Logical formLearned from36 sentences. A reference can be to complaints.Logical formLearned from36 sentences. A reference can be to a (peace process).Logical formLearned from36 sentences. References can be to a US-city.Logical formLearned from35 sentences. A reference can be on a subject.Logical formLearned from35 sentences. A reference can be famous.Logical formLearned from35 sentences. References can be to episodes.Logical formLearned from35 sentences. References can be blatant.Logical formLearned from35 sentences. Reference can be to a city.Logical formLearned from35 sentences. A reference can be to a debate.Logical formLearned from35 sentences. A reference can be unambiguous.Logical formLearned from35 sentences. A reference may be used.Logical formLearned from35 sentences. A person may find references.Logical formLearned from35 sentences.