@article {IOPORT.50345110,
    author       = {Eberly, David H. and Lancaster, Jack},
    title        = {On gray scale image measurements : I. Arc length and area},
    year         = {1991},
    journal      = {CVGIP: Graphical Model and Image Processing},
    volume       = {53},
    number       = {6},
    pages        = {538-549},
    doi          = {10.1016/1049-9652(91)90004-4},
    identifier   = {50345110},
}