For citations:
Kryukov E.V., Savushkina O.I., Chernyak A.V., Kulagina I.C. Diagnosing ventilation inhomogeneity after COVID-19 by multiple-breath nitrogen washout test. PULMONOLOGIYA. 2021;31(1):30-36. (In Russ.) https://doi.org/10.18093/0869-0189-2021-31-1-30-36