2 citations to https://www.mathnet.ru/rus/mzm2394

1. Vladimir Klyachin, “THE ESTIMATES OF PRINCIPLE FREQUENCY OF DOMAINS ON RIEMANNIAN MANIFOLDS AND MINIMAL SURFACES STABILITY”, Mathematical Physics and Computer Simulation, 27:3 (2024), 15  
2. Qing Chen, “On the first eigenvalue of minimal submanifolds”, Kodai Math. J., 20:2 (1997)