The Amalgamation Property in Classical Lebesgue-Riesz Spaces, Banach   Spaces with Transitive and Almost Transitive Norms and Projection Constants
  In the article is shown that classes of finite equivalence that are generated by Lebesgue-Riesz spaces Lp have the amalgamation property if and only if p is not equal to an even natural number that is strongly large then 2. 
Efim Positselskii and Eugene Tokarev