@article{AMI_2009_36_a2,
     author = {A. Bremner and R. H{\o}ibakk and D. Lukkassen},
     title = {Crossed ladders and {Euler{\textquoteright}s} quartic},
     journal = {Annales mathematicae et informaticae},
     pages = {29--41},
     publisher = {mathdoc},
     volume = {36},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2009_36_a2/}
}