Source: https://books.google.ru/books?id=rKWif9neKRYC&pg=PA302&lpg=PA302&dq=potok+inter+air&source=bl&ots=zdKC6CYBLu&sig=ACfU3U0daJwjme6nE3TQPNYaIASQTBSU_w&hl=en&sa=X&ved=2ahUKEwjQhp-49fTpAhVlpYsKHZOGDEsQ6AEwCXoECBsQAQ#v=onepage&q=potok%20inter%20air&f=false