The artists claim the organisers did not respond to their request for removal from the Visitors' Lions prize vote, which the Biennale disputes

Mataaho Collective, Samia Halaby and Karimah Ashadu also receive awards

The itinerant lives of the Brazilian and Turkish artists chime with the theme of his central exhibition next year

Simone Leigh, Zineb Sedira and Ali Cherri also receive awards

Honour bestowed on four previous artistic directors of the international exhibition