A note on type P methods of summation
Compositio Mathematica, Tome 22 (1970) no. 1, pp. 23-28. 
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Brown, H. I. A note on type $P$ methods of summation. Compositio Mathematica, Tome 22 (1970) no. 1, pp. 23-28. http://archive.numdam.org/item/CM_1970__22_1_23_0/

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