This paper provides a definition of proof-nets for non-commutative linear logic (cyclic linear logic and Lambek calculus) where there are no links, that are small graphs representing the connectives. Instead of a tree like representation with links, the formula is depicted as a graph representing the conclusion up to the algebraic properties of the connectives. In the commutative case the formula is viewed as a cograph. In the non-commutative case it is a more complicated kind of graph which is, roughly speaking, a directed cograph. The criterion consists in the commutative condition plus a bracketing condition.