2 citations to https://www.mathnet.ru/rus/os1

1. Jun-Wen Luo, De-Wei Wu, Qiang Miao, Tian-Li Wei, “Research progress in non-classical microwave states preparation based on cavity optomechanical system”, Acta Phys. Sin., 69:5 (2020), 054203  
2. S. N. Filippov, “On quantum operations of photon subtraction and photon addition”, Lobachevskii J. Math., 40:10 (2019), 1470–1478