Quirk, R., Greenbaum, S., Leech, G., & Svartvik, J. (1985). A comprehensive grammar of the English language. New York: Longman Inc.
has been cited by the following article:
TITLE: A Comparative Study of “as” and “Which” in Non-Restrictive Relative Clauses
AUTHORS: Jiancheng Wang, Junhong Tang
KEYWORDS: Non-Restrictive Relative Clause; Relative Words; As; Which
JOURNAL NAME: Open Journal of Modern Linguistics, Vol.3 No.4, November 8, 2013
ABSTRACT: Both “as” and “which” can introduce a non-restrictive relative clause. But each of them has its own particular function in meaning, part of speech and sentence structure. Therefore sometimes they can have similar usage in a certain situation, while most often they are quite different and can not be used alternatively.