@article{10_1017_S0017089517000313,
     author = {THAS, JOSEPH A. and THAS, KOEN},
     title = {COVERS {OF} {GENERALIZED} {QUADRANGLES}},
     journal = {Glasgow mathematical journal},
     pages = {585--601},
     year = {2018},
     volume = {60},
     number = {3},
     doi = {10.1017/S0017089517000313},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089517000313/}
}