[en] The level structures of nuclei evolve from single particle to collective nature, as one goes away from Z=50 and N=82 shell gap. The transitional nuclei around A∼135 with Z > 50 and N < 82 which lie between the spherical and deformed regions show complex and rich level structures due to interplay of single-particle and collective excitation modes. Recently, the isomers in ^135,136La isotopes in this region have attracted lot of attention. With the advancement of large scale shell model calculations, it is now possible to analyze the structures of these isomers. The detailed results on nuclear moment measurements in ^133,135La will be presented in the meeting to understand the structure of the isomers in lanthanum isotopes