Lulu.com has published a monograph "Group Methods of Data Processing" edited by Oleg Chertov. Contributing authors are Oleg Chertov, Dan Tavrov, Dmytro Pavlov, Margarita Alexandrova, Volodymyr Malchikov.
In this book, the authors presented a bunch of methods for group data processing, and illustrated their applications with real-life examples.
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