Leonard Euler

Of Impossible, or Imaginary Quantities, which arise from the same source

Leonard Euler, 1972 .

On the Method of rendering Surd Quantities of the form √ (a+bx+cx2) Rational

Leonard Euler, 1972 .

Of the Calculation of Interest

Leonard Euler, 1972 .

Introduction to Analysis of the Infinite: Book I

Leonard Euler, P. Shiu, P. Shiu, 1988, The Mathematical Gazette.