1. T. Takaoki, T. Iwasaki, Y. Katoh, et al., “Use of hydrate pellets for transportation of natural gas. 1. Advantage of pellet form of natural gas hydrate in sea transportation,” in: Proc. of the 4th Int. Conf. on Gas Hydrates (Yakohama, Japan, May 19–23, 2002), S. n., Yakohama (2002), pp. 982–986.
2. Y. Nakajima, T. Takaoki, K. Ohgaki, and S. Ota, “Use of hydrate pellets for transportation of natural gas. 2. Proposition of natural gas transportation in form hydrate pellets,” ibid. pp. 987–990.
3. S. Ota, H. Uetani, and Y. Kawano, “Use of hydrate pellets for transportation of natural gas. 3. Safety measures and conceptual design of natural gas hydrate pellet carrier,” ibid., pp. 991–996.
4. J. Gudmundsson, M. Mork, and O. Graff, “Hydrate non-pipeline technology,” ibid., pp. 997–1002.
5. R. Ohmura, S. Kashiwazaki, S. Shiota, et al., “Structure-1 and structure-2 hydrate formation using water spraying,” ibid., pp. 1049–1054.