@Article{JGAA-11,
   author = {{Alice} M. {Dean} and {Joan} P. {Hutchinson}},
   title = {Rectangle-visibility Layouts of Unions and Products of Trees},
   journal = {Journal of Graph Algorithms and Applications},
   year = {1998},
   volume = {2},
   number = {8},
   pages = {1--21},
   doi = {10.7155/jgaa.00011}
}