I'm looking for some stuff concerning the physics and mathematics of soap films and soap bubbles - I mean things like the surface tension mechanism, Young-Laplace equation etc. and the mathematical side of the subject, i.e. minimal surfaces, mean curvature etc. I know that there are two nice books on this topic, J. Oprea "The Mathematics of Soap Films" and C. Isenberg "The Science of Soap Films and Soap Bubbles", but unfortunately I've been unable to get them, so I'd be glad if anyone could recommend something easily available on the web. I'm familiar with things like Euler-Lagrange equations, principles of differential geometry etc., so the materials needn't be on a very basic level.