@article{wiebe_2007,  title={Applications of nucleoside-based molecular probes for the in vivo assessment of tumour biochemistry using positron emission tomography (PET)},  volume={50},  ISSN={1516-8913},  url={https://doi.org/10.1590/S1516-89132007000300011},  DOI={10.1590/S1516-89132007000300011},  number={3},  journal={Brazilian Archives of Biology and Technology},  publisher={Instituto de Tecnologia do Paraná - Tecpar},  author={Wiebe, Leonard I.},  year={2007},  month={May},  pages={445–459} }