@article{Khrapko:2000,
	author = {R. I. Khrapko},
	title = {What is mass?},
	publisher = {Physics-Uspekhi},
	year = {2000},
	journal = {Phys. Usp.},
	volume = {43},
	number = {12},
	pages = {1267-1270},
	url = {https://ufn.ru/en/articles/2000/12/h/},
	doi = {10.1070/PU2000v043n12ABEH000778}
}