Mishra V, Ishwar B. Normalisation of Hamiltonian in photogravitational elliptic restricted three body problem with Poynting-Robertson drag. IJAA [Internet]. 2015 Apr. 28 [cited 2024 May 2];3(1):42-5. Available from: https://sciencepubco.com/index.php/IJAA/article/view/4534