@inproceedings{inproceedings7454a103,
title   = {Orbital angular momentum exchange in an optical parametric oscillator},
author = {Martinelli, Marcelo and Huguenin, J A O and Nussenzveig, Paulo Alberto and Khoury, A Z},
year = {2004},
publisher = {IFSC-USP},
booktitle   = {International Conference on Atomic Physics}
}