On a medieval circle quadrature : De circulo quadrando / Wilbur R. Knorr.
Abstract:
'I discuss this text and an alternative version (incipit: "Quelibet media proportionalia"), their relation to each other, and the question of their authorship. The pattern of their circulation suggests connections between the masters of geometry at Oxford and Paris in the 13th century.'
Historia mathematica Vol. 18 (1991), p. 107-128