@article{JOLT_2017_27_2_a8,
     author = {Masaya Tomie and Yoji Yoshii},
     title = {Reduced {Hyperbolic} {Root} {Systems} of {Rank} 2},
     journal = {Journal of Lie Theory},
     pages = {469--499},
     year = {2017},
     volume = {27},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2017_27_2_a8/}
}