@inbook{euler:1768:ici,
    author = {Euler, L.},
     title = {Institutiones Calculi Integralis},
    series = {Opera Omnia (1)},
    volume = {11},
     pages = {110–113},
      year = {1768},
 publisher = {B. G. Teubner},
   address = {Leipzig-Berlin}}