@article{DAN_1960_133_1_a14,
     author = {I. Ya. Dekhtyar and V. S. Mikhalenkov},
     title = {An investigation of the angular correlation of the $\gamma$-quanta produced by the annihilation of positrons 
},
     journal = {Doklady Akademii Nauk},
     pages = {60--63},
     publisher = {mathdoc},
     volume = {133},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_1_a14/}
}