@article{JGG_1997_1_1_a7,
     author = {L. Gilewicz and W. Gilewicz},
     title = {Perspective {Drawing} in the {Architectural} {Design} {Process}},
     journal = {Journal for geometry and graphics},
     pages = {059--066},
     year = {1997},
     volume = {1},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JGG_1997_1_1_a7/}
}