The axiomatic melting point. Teaching probability theory in Prague during the 1930's. Bilová, Štěpánka, Mazliak, Laurent, Šišma, Pavel (2006) Journal Électronique d'Histoire des Probabilités et de la Statistique [electronic only]
The divergence theorem Josef Král (1996) Mathematica Bohemica This is an expository paper dealing with Jan Marik's results concerning perimeter and the divergence theorem of Gauss-Green-Ostrogradski.