@article{ZNSL_2019_480_a10,
     author = {V. A. Kostin and A. V. Kostin and D. V. Kostin},
     title = {Operator sine-functions and trigonometric exponential pairs},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {162--169},
     year = {2019},
     volume = {480},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2019_480_a10/}
}