| 311, "In terms of immediate mutual intelligibility, the East Slavic zone is a single language | A guide to the world's languages: Classification Vol |
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| The Future of the Global Muslim Population |
| Syed Yasir Kazmi October 16, 2009 | |
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| Classification and Index of the World's Languages Elsevier |
Many Ukrainians in fact speak a mixture of Ukrainian and Russian, finding it difficult to keep the two languages apart.
4| 145—146: "The three East Slavonic languages are very close to one another, with very high rates of mutual intelligibility | |
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| 60: "[The] distinction between dialect and language being blurred, there can be no unanimity on this issue in all instances |