1. 2015 WHO Model List of Essential Medicines. http://www.who.int/medicines/publications/essentialmedicines/en/
2. Formulary availability and regulatory barriers to accessibility of opioids for cancer pain in Europe: a report from the ESMO/EAPC Opioid Policy Initiative;Cherny;Ann Oncol,2010
3. The Global Opioid Policy Initiative (GOPI) project to evaluate the availability and accessibility of opioids for the management of cancer pain in Africa, Asia, Latin America and the Caribbean, and the Middle East: introduction and methodology;Cherny;Ann Oncol,2013
4. ESMO European Consortium Study on the availability, out-of-pocket costs and accessibility of anti-neoplastic medicines. Nathan I Cherny, Richard Sullivan, Julie Torode, Marika Saar, Alexandru Eniu. To be published in Annals of Oncology in 2016. http://www.esmo.org/Policy/Anti-Cancer-Medicines-Availability/European-Study
5. ESMO International Consortium Study on the availability, out-of-pocket costs and accessibility of anti-neoplastic medicines. Nathan I Cherny, Richard Sullivan, Julie Torode, Marika Saar, Alexandru Eniu. To be published by ESMO in 2016. http://www.esmo.org/Policy/Anti-Cancer-Medicines-Availability/International-Study