Some Problems with Accents in TeX : Letters with Multiple Accents and Accents Varying for Uppercase/Lowercase Letters
Cahiers GUTenberg, Actes de la Xe conférence TeX européenne, Saint-Malo, mars 1998, no. 28-29 (1998), pp. 44-55.

The problems of using the internal command +\accent+ as a tool for support of some Cyrillic writing systems is investigated. It is shown that the internal features of +\accent+ prevent construction of some Cyrillic letters which require several accents simultaneously. A special macro which emulates the work of +\accent+ by some other commands is suggested. The accents for I/i and J/j, which are different for uppercase and lowercase letters, are also considered. If-then-else structures by use of which correct accents can be placed, depending on the letter case, are proposed. A similar technique can be used for case change of the Cyrillic “capital form” ligatures Љ and Њ.

@article{CG_1998___28-29_44_0,
     author = {Berdnikov, A.S. and Grineva, O.A.},
     title = {Some {Problems} with {Accents} in {TeX~:} {Letters} with {Multiple} {Accents} and {Accents} {Varying} for {Uppercase/Lowercase} {Letters}},
     journal = {Cahiers GUTenberg},
     pages = {44--55},
     publisher = {Association GUTenberg},
     number = {28-29},
     year = {1998},
     language = {fr},
     url = {http://archive.numdam.org/item/CG_1998___28-29_44_0/}
}
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Berdnikov, A.S.; Grineva, O.A. Some Problems with Accents in TeX : Letters with Multiple Accents and Accents Varying for Uppercase/Lowercase Letters. Cahiers GUTenberg, Actes de la Xe conférence TeX européenne, Saint-Malo, mars 1998, no. 28-29 (1998), pp. 44-55. http://archive.numdam.org/item/CG_1998___28-29_44_0/