@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040017,
 author = {Mikami, Kentaro and Nakae, Yasuharu},
 issue = {4},
 journal = {Journal of mathematical sciences, the University of Tokyo},
 month = {Mar},
 pages = {699--716},
 title = {Lower Weight Gel’fand-Kalinin-Fuks Cohomology Groups of the Formal Hamiltonian Vector Fields on R4},
 volume = {19},
 year = {2013}
}