@article{CTT100642847,
  author = {Shigekazu Ito and Manabu Kikuchi and Joji Miura and Noboru Morita and Masaaki Yoshifuji},
  title = {Spectroscopic and stability studies on unsymmetrical 1,3-dialkyl-1,3- diphosphacyclobutane-2,4-diyls},
  journal = {Journal of Physical Organic Chemistry},
  year = 2012,
}

@article{CTT100583948,
  author = {Shigekazu Ito and Manabu Kikuchi and Hiroki Sugiyama and Masaaki Yoshifuji},
  title = {Synthesis and Properties of Air-Stable 1,3-Diphosphacyclobutane-2,4-diyls and the Related Compounds},
  journal = {J. Organomet. Chem.},
  year = 2007,
}

@article{CTT100583954,
  author = {Shigekazu Ito and Manabu Kikuchi and Masaaki Yoshifuji and Anthony J. Arduengo, III and Tatyana A. Konovalova and Lowell D. Kispert},
  title = {Preparation and Characterization of an Air-tolerant 1,3-Diphosphacyclobuten-4-yl Radical},
  journal = {Angew. Chem. Int. Ed.},
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}