«Janus beads»: realization and behaviour at water/oil interfaces Casagrande, C. ; Fabre, P. ; Raphaël, E. ; Veyssié, M. Abstract Publication: EPL (Europhysics Letters) Pub Date: June 1989 DOI: 10.1209/0295-5075/9/3/011 Bibcode: 1989EL......9..251C