@article {Vel93,
AUTHOR = {Veli{\v{c}}kovi{\'c}, Boban},
TITLE = {{${\rm OCA}$} and automorphisms of {${\scr P}(\omega)/{\rmfin}$}},
JOURNAL = {Topology Appl.},
FJOURNAL = {Topology and its Applications},
VOLUME = {49},
YEAR = {1993},
NUMBER = {1},
PAGES = {1--13},
}