Development of standardized English language test in USSRKokkota, ValmarLanguage testing newsletter1983 / p. 15-16 Investigation of different kinds of cloze testsKokkota, ValmarLanguage testing newsletter1983 / p. 16-17 Letter-deletion procedure: a flexible way of reducing text redundancyKokkota, ValmarLanguage testing newsletter1988 / p. 115-119 https://www.ester.ee/record=b3041499*est https://journals.sagepub.com/doi/abs/10.1177/026553228800500108