Gas Emission Craters and Mound-Predecessors in the North of West Siberia, Similarities and Differences oleh Alexander Kizyakov, Marina Leibman, Mikhail Zimin, Anton Sonyushkin, Yury Dvornikov, Artem Khomutov, Damien Dhont, Eric Cauquil, Vladimir Pushkarev, Yulia Stanilovskaya