1. Karasev, M.V. and Maslov, V.P., Nelineinye skobki Puassona. Geometriya i kvantovanie (Nonlinear Poisson Brackets. Geometry and Quantization), Moscow: Nauka, 1991.
2. Maslov, V.P., Mat. Zametki, 1997, vol. 62, no. 4, pp. 633–634.
3. Ruuge, A.E., On the Structure of the Ground Antisymmetric State of a Semiclassical Series of the Schrödinger Operator, Preprint MSU, Moscow: Moscow State Univ., 1999, no. 4.
4. Ruuge, A.E., Mat. Zametki, 2000, vol. 67, no. 2, pp. 257–269.
5. Ruuge, A.E., Mat. Zametki, 1999, vol. 66, no. 1, pp. 154–156.