: Pravila russkoj orfografii i punktuacii) of 1956 is the current reference to regulate the modern Russian language.
[1] However, it became a rare book and its principles are learned from school-books and manuals based upon it.
In particular, the spellings of such words as maître (мэтр, metr) or racket (рэкет, reket) are given with "э", whereas in other rules there are three fixed words in which a hard consonant is followed by "э": peer (пэр, per), mayor (мэр, mer) and sir (сэр, ser).
In 1990 an attempt was made to fill the gaps in the Rules of Russian Orthography and Punctuation.
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