- The book has been published by B. Ranguelov., A. Frantsova., 2017. Multihazards early warnings. Research, models and Bulgarian expertise., LAMBERT Academic Publishing., Saarbrucken, 224 pp. ISBN: 978-620-2-07727-9 and can be downloaded from https://www.amazon.it/Multihazard-early-warnings-Research-Bulgarian-expertise/dp/6202077271