“…In the case p = 2, the above (δ, R 0 )-BMO condition was introduced in [6], whereas such a condition for general p ∈ (1, ∞) appears in the recent paper [29]. We remark that the (δ, R 0 )-BMO condition allows A(x, ξ) has discontinuity in x and it can be used as an appropriate substitute for the Sarason [33] VMO condition (see, e.g., [5,6,18,25,34,37]).…”