Natal’ya V. Nikolenkova, Ding Qiang. The Uppercase Rule as a Peripheral Zone of Russian Orthography
Russian Speech. 2023. № 1, Pages. 66 - 76

Aleksandr G. Kravetsky. Capital or Lowercase Letters? The History of Orthography Practices in the 17th and 18th Centuries
Russian Speech. 2022. № 1, Pages. 71 - 81