@misc{RCM_2008_42_2_a1,
     title = {An optimal 3-point quadrature formula of closed type and error bounds},
     journal = {Revista colombiana de matematicas},
     pages = {209--220},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {2008},
     url = {http://geodesic.mathdoc.fr/item/RCM_2008_42_2_a1/}
}