[1]
Goodman, G.S. and Yorke, J.A. 1970. Misbehaviour of Solutions of the Differential Equation $y’=f(x,y)+\varepsilon$ when the Right Hand Side is Discontinuous. MATHEMATICA SCANDINAVICA. 27, (Jun. 1970), 72–76. DOI:https://doi.org/10.7146/math.scand.a-10988.