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[1]
MATYUSHENKO NN, 1963, KRISTALLOGRAFIYA, V8, P451
[2]
SAMSONOV GV, 1966, BERILLIDY
[3]
VASINA EA, 1971, IZV AN SSSR M, V2, P32
[4]
VASINA EA, 1974, IZV AN SSSR M, P1