The PWA of π−π0 system in the presence of a significant irremovable background oleh Mikhasenko M., Dorofeev V., Ekimov A., Gotman V., Ivashin A., Kachaev I., Kalendarev V., Khokhlov Yu., Kholodenko M., Konstantinov V., Kravchenko S., Matveev V., Nikolaenko V., Plekhanov A., Ryabchikov D., Salomatin Yu., Sugonyaev V., Zaitsev A.