DOC:10.1068/b260033
DOC:10.1068/htjr038
DOC:10.1068/htjr093
DOC:10.1068/htjr097
DOC:10.1068/htjr121
DOC:10.1068/htob3
DOC:10.1068/htrt171
DOC:10.1068/htrt203
DOC:10.1068/p2896