Bondarenko V. V.
Ukr. Mat. Zh. - 2012. - 64, № 7. - pp. 892-907
We give a complete description of real numbers that are $P$-limit numbers for integer-valued positive-definite quadratic forms with unit coefficients of the squares. It is shown that each of these $P$-limit numbers is realized in the Tits quadratic form of a Dynkin diagram.