@article {OA1990,
	title = {Experimental Research of the Boron Nitride Diffusion},
	journal = {Elektropromishlenost i Priborostroene (now: Elektrotechnica \&amp; Elektronica)},
	number = {1},
	year = {1978},
	month = {January},
	pages = {31{\textendash}35},
	url = {http://oa.uninova.pt/1990/},
	author = {Alexander Atanasov and Ivan Valtchev and Dobrinka Kolevska and Stanimir Valtchev}
}
