Aldanov, V. M.; Mikhalin, G. A. Tauberian Theorems With Remainder for (<em class="a-Plus-plus">H, P, α, β</em>)-and (<em class="a-Plus-plus">C, P, α, β</Em&gt;)-Methods of Summation of Functions of Two Variables. Ukr. Mat. Zhurn. 1999, 51, 1036–1044.