The general methods of finding the sum S n for all kinds of series, II K. Orlov (1981) Matematički Vesnik
The general methods of finding the sum S n for all kinds of series K. Orlov (1981) Matematički Vesnik
The higher derivatives of the inverse tangent function and rapidly convergent BBP-type formulas for pi. Adegoke, Kunle, Layeni, Olawanle (2010) Applied Mathematics E-Notes [electronic only]
The high-precision summation of series whose terms are rational numbers W. Szafrański (1983) Applicationes Mathematicae