@article {Valtchev2008,
	title = {An electrical gearbox by means of pole variation for induction and superconducting disc motor},
	journal = {Journal of Physics: Conference Series},
	volume = {97},
	number = {1},
	year = {2008},
	note = {n/a},
	abstract = {n/a},
	author = {S In{\'a}cio and D In{\'a}cio and J M Pina and S Valtchev and M V Neves and A L Rodrigues}
}
