@article{NUMA_1965__7_131664,
     author = {H. GREENSPAN and W. HAFNER and M. RIBARIC},
     title = {On {Varying} {Stepsize} in {Numerical} {Integration} of {First} {Order} {Differential} {Equations.}},
     journal = {Numerische Mathematik},
     pages = {286--291},
     publisher = {mathdoc},
     volume = {7},
     year = {1965},
     zbl = {0131.14501},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1965__7_131664/}
}