Une Famille De 5-Tissus Plans Exceptionnels
  We give a one parameter family of exceptional planar 5-webs. Each web is formed by four pencils of lines and by a foliation defined by the level curves of a function sn_k(x)sn_k(y) where sn_k denotes a Jacobi's elliptic function. 
Luc Pirio and Jean-Marie Tr\'epreau