= Quantum mechanical re-interpretation of kinematic and mechanical relations by Heisenberg (1925)
{title2=Über quantentheoretische Umdeutung kinematischer und mechanischer Beziehungen}
This <Heisenberg>'s breakthrough paper on <matrix mechanics> which later led to the <Schrödinger equation>, see also: <history of quantum mechanics>.
Published on the <Zeitschrift für Physik> volume 33 page pages 879-893, https://link.springer.com/article/10.1007%2FBF01328377
Modern overview: http://www.mat.unimi.it/users/galgani/arch/heisenberg25amer_j_phys.pdf