SVÁČEK, P. Variational formulation of BVP with singular coefficients related to the solution of geodynamo models. ISBN 80-223-1185-5. In: BRESTENSKÝ, J., ŠEVČÍK, S., eds. Stellar and planetary magnetoconvection. Bratislava: Comenius University, 1997, s. 79-94. Acta Astronomica et Geophysica Universitatis Comenianae., 19.