Matvievskaya, Galina (1987). "The Theory of Quadratic Irrationals in Medieval Oriental Mathematics". Annals of the New York Academy of Sciences. 500: 253–277 [259]. डीओआइ:10.1111/j.1749-6632.1987.tb37206.x.
Matvievskaya, Galina (1987). "The Theory of Quadratic Irrationals in Medieval Oriental Mathematics". Annals of the New York Academy of Sciences. 500: 253–277 [260]. डीओआइ:10.1111/j.1749-6632.1987.tb37206.x. .
Matvievskaya, Galina (1987). "The Theory of Quadratic Irrationals in Medieval Oriental Mathematics". Annals of the New York Academy of Sciences. 500: 253–277 [261]. डीओआइ:10.1111/j.1749-6632.1987.tb37206.x. .